Explanation
If LenoxSoft has a Marketing Cloud Account Engagement form titled "Request a Demo" on their external website, they should use the Form Report to see how many views their form has received (D). The Form Report shows the number of views, submissions, and conversions for each form created in Marketing Cloud Account Engagement. The Conversions Report (A) shows the number of prospects who converted from anonymous visitors to identified prospects. The Landing Page Report (B) shows the number of views, submissions, and conversions for each landing page created in Marketing Cloud Account Engagement. The Form Handler Report shows the number of submissions and conversions for each form handler created in Marketing Cloud Account Engagement. References: Account Engagement Campaign Reporting

Completion actions are actions that Marketing Cloud Account Engagement executes after a prospect successfully completes a desired activity, such as submitting a form or clicking a custom link. Completion actions only affect prospects, not visitors, because visitors are anonymous and have not been identified by Marketing Cloud Account Engagement yet

Explanation
According to the Salesforce documentation, the editions of Salesforce that can sync with Marketing Cloud Account Engagement are: C) Professional Edition and higher. A sync between Salesforce and Marketing Cloud Account Engagement is a feature that allows users to connect and exchange data between the two platforms, such as leads, contacts, accounts, campaigns, or opportunities. A sync between Salesforce and Marketing Cloud Account Engagement can be configured by the administrator in the connector settings, and it can be customized for different objects, fields, or actions. A sync between Salesforce and Marketing Cloud Account Engagement can help users to keep their data consistent and accurate, to automate their sales and marketing processes, and to measure and optimize their performance and results. A sync between Salesforce and Marketing Cloud Account Engagement can be done with different editions of Salesforce, depending on the features and functionalities that the user needs. The editions of Salesforce that can sync with Marketing Cloud Account Engagement are: Professional Edition, Enterprise Edition, Unlimited Edition, and Performance Edition. These editions of Salesforce can sync with Marketing Cloud Account Engagement, and they can also access additional features, such as custom objects, multiple scoring categories, or B2B Marketing Analytics.
The edition of Salesforce that cannot sync with Marketing Cloud Account Engagement is: Standard Edition.
This edition of Salesforce does not have the ability to sync with Marketing Cloud Account Engagement, and it does not have access to the additional features that the other editions have. Therefore, the user needs to upgrade to a higher edition of Salesforce if they want to sync with Marketing Cloud Account Engagement and use the advanced features. References: Salesforce documentation

The three things that will affect the prospect records based on these activities are:
Bob's prospect record will show him clicking on the link and filling out the form. This is because when an unknown visitor fills out a form, they become a known prospect and their previous activities are tracked and associated with their prospect record1.
Kate's prospect record will show her clicking on the link and filling out the form. This is because Marketing Cloud Account Engagement tracks the activities of known prospects who interact with your marketing assets, such as custom redirects and forms2.
Kate's prospect record will have a tag of "clicked" applied to it. This is because the custom redirect has a completion action to add a tag of "clicked" to all prospects that click it, and completion actions are actions that Marketing Cloud Account Engagement executes after a prospect successfully completes a desired activity

The information that is required when creating a prospect manually is campaign, email, profile, and score. A prospect is a potential customer who has expressed some interest in your products or services, and whose information you have captured in Marketing Cloud Account Engagement. You can create a prospect manually in Marketing Cloud Account Engagement by entering their information in a form, or by importing them from a file. When creating a prospect manually, you need to provide the following information:
Campaign: The marketing initiative that you use to track the first touch point with the prospect, such as a trade show, a webinar, or a Google Ad. You can select a campaign from the drop-down menu, or use the default campaign that you set in your account settings.
Email: The email address of the prospect, which is used as the unique identifier for the prospect record. You need to enter a valid email address for the prospect, or the prospect will not be created.
Profile: The category that you use to segment your prospects based on their characteristics, such as industry, role, or product interest. You can select a profile from the drop-down menu, or use the default profile that you set in your account settings.
Score: The numerical value that indicates the level of interest or engagement of the prospect in your products or services. You can enter a score for the prospect, or use the default score of 0 that is assigned to new prospects.
Other information that you can provide when creating a prospect manually are:
First Name: The first name of the prospect, which can be used for personalization or segmentation.
Last Name: The last name of the prospect, which can be used for personalization or segmentation.
Company: The name of the company that the prospect works for, which can be used for reporting or segmentation.
Website: The URL of the website that the prospect visits or owns, which can be used for tracking or segmentation.
Assign To: The user that you want to assign the prospect to, who will be responsible for following up with the prospect. You can select a user from the drop-down menu, or use the default user that you set in your account settings.