Explanation
The user role that a Marketing Cloud Account Engagement user must have in order to verify the Salesforce connector is Administrator. A Salesforce connector is a feature that allows you to connect your Marketing Cloud Account Engagement account with your Salesforce CRM system, and enable bi-directional data sync and alignment between sales and marketing. To verify the Salesforce connector, you need to have the Administrator user role in Marketing Cloud Account Engagement, which gives you full access to all features and settings in Marketing Cloud Account Engagement, including the connectors. You also need to have the appropriate permissions in Salesforce, such as the API Enabled and Modify All Data permissions

To see why the email was not sent to the prospect, the marketing manager should refer to the list email send report to see if a suppression list was used. A suppression list is a list of prospects who should not receive a specific email, even if they are on the recipient list. If the prospect was on a suppression list, they would not receive the email. The other options are not likely to explain why the email was not sent, as the prospect was already on the recipient list and was mailable

Explanation
According to the Salesforce documentation, the advice that should be offered to the client who is looking for a way to increase the quality of leads that are being passed from marketing to sales is: B) Implement a blended lead scoring and grading system. A lead scoring and grading system is a feature that allows users to measure and qualify the prospects based on their level of interest and fit for the business. A lead scoring and grading system can help users to prioritize and segment the prospects, and to pass the most qualified leads from marketing to sales. A lead scoring and grading system consists of two components: scoring and grading.
Scoring is a numerical value that indicates the level of interest and engagement of a prospect, based on their activities, such as opening an email, clicking a link, or submitting a form. Scoring can be done automatically by the default scoring model in Marketing Cloud Account Engagement, or manually by customizing the scoring rules. Grading is a letter value that indicates the level of fit of a prospect, based on their attributes, such as industry, job title, location, or company size. Grading can be done manually by creating profiles and matching them with the prospect's information. By implementing a blended lead scoring and grading system, the client can increase the quality of leads that are being passed from marketing to sales, as they can identify the prospects who have both a high score and a high grade, meaning that they are both interested and suitable for the business. Only passing on leads that are very active on the site no matter the company profile, automatically assigning all leads to sales reps in a round-robin system, or adding more landing pages and forms to the site to increase the number of conversion opportunities are not the best advice that should be offered to the client who is looking for a way to increase the quality of leads that are being passed from marketing to sales, as they are either ineffective, inefficient, or irrelevant ways of qualifying and prioritizing the leads. References: Salesforce documentation

What is needed for a page action to trigger for a prospect visiting a high value web page is adding a page action and Marketing Cloud Account Engagement tracking code on the page. A page action is a Marketing Cloud Account Engagement feature that allows the administrator to perform certain actions when a prospect views a specific page on the website, such as increasing the score, changing the field value, adding to a list, etc. A page action can be created by entering the URL of the page and selecting the actions to be performed. A Marketing Cloud Account Engagement tracking code is a snippet of code that can be added to the website to track the page views and activities of visitors and prospects on the website. The Marketing Cloud Account Engagement tracking code is required for the page action to work, as it identifies the prospects who visit the page and executes the actions on them. Creating an automation rule, adding a completion action, or adding a page action on the form are not what is needed for a page action to trigger for a prospect visiting a high value web page. An automation rule is a rule that runs in the background and matches prospects based on certain criteria and performs certain actions. An automation rule can use page views as a criterion, but it is not the same as a page action, as it does not depend on a specific URL. A completion action is an action that is triggered when a prospect completes a specific activity, such as submitting a form, clicking a link, or opening an email. A completion action is not related to a page view, unless the page contains a form or a link. A page action on the form is not possible, as a page action can only be added on a page, not on a form. Reference [Page Actions] [Marketing Cloud Account Engagement Tracking Code]

Explanation
The Salesforce field type that is unsupported for syncing with Marketing Cloud Account Engagement is Lookup. Lookup fields are fields that allow you to create a relationship between two objects in Salesforce, such as Account and Contact. Marketing Cloud Account Engagement does not support syncing Lookup fields, because they are not compatible with Marketing Cloud Account Engagement's data model and could cause data inconsistencies or errors. Marketing Cloud Account Engagement supports syncing most other Salesforce field types, such as Text, Number, Picklist, and Formula.