Explanation
According to the Salesforce documentation, the feature in Salesforce that can be enabled to show landing page engagement data on a Salesforce Campaign page layout is Engagement History. Engagement History is a feature that allows users to view and report on how prospects interact with Marketing Cloud Account Engagement marketing assets, such as emails, forms, landing pages, and custom redirects. Engagement History can be enabled for Salesforce Campaigns, Leads, Contacts, Accounts, and Opportunities, and it can display metrics such as views, clicks, submissions, and conversions. Advanced Dynamic Content, Marketing Cloud Account Engagement Activities Visualforce page, and B2B Marketing Analytics are not features that can show landing page engagement data on a Salesforce Campaign page layout, as they are related to other aspects of marketing automation, such as personalization, activity tracking, and analytics.
References: Salesforce documentation

In the enhanced landing page experience within Salesforce, one of the key features is the ability to associate a landing page with either a connected campaign (directly linked to Salesforce campaigns for unified reporting and management) or an unconnected campaign (used solely within Pardot). This flexibility allows marketers to tailor their campaign management strategies according to their specific needs, enhancing the integration and tracking of various marketing efforts directly from within Salesforce.

The three variable tags that can be used on layout templates for landing pages are %%description%%, %%title%%, and %%content%%. A layout template is a reusable HTML template that defines the structure and style of your landing pages. A variable tag is a placeholder that allows you to insert dynamic content into your layout template, such as the landing page title, description, or form. You can use variable tags to customize your layout template for different landing pages, without having to edit the HTML code every time.

The two characteristics that must be true of the list that the prospect can view and opt out of on the Marketing Cloud Account Engagement Email Preference Center are that it is a Static List and that it is a CRM Visible List. A Static List is a list that is manually populated by the marketer or the prospect. A prospect can opt out of a Static List by clicking on the unsubscribe link in an email or by visiting the Email Preference Center and deselecting the list. A CRM Visible List is a list that is synced with a Salesforce campaign and can be viewed and reported on in Salesforce. A prospect can be removed from a CRM Visible List if they no longer meet the criteria of the Salesforce campaign, such as having a certain score or status. Option B is not correct because a Dynamic List is a list that is automatically populated by Marketing Cloud Account Engagement based on criteria that match prospect fields. A prospect cannot opt out of a Dynamic List, but they can be removed from the list if they no longer meet the criteria. Option D is not correct because a Public List is a list that is visible on the Email Preference Center and can be opted in or out by the prospect. A Public List can be either a Static List or a Dynamic List, but it is not a characteristic that affects the prospect's removal from the list. Reference: Marketing Cloud Account Engagement Email Preference Center Best Practices - Salesforce Ben, Create a Custom Email Preference Center Page - Salesforce, Crafting Clear Marketing Communication with Marketing Cloud Account Engagement Email Preference Centers

Explanation
Once a Salesforce Opportunity syncs to Marketing Cloud Account Engagement, two actions that can be taken are referencing the Opportunity in automation rules and viewing the Opportunity in Opportunity Reports.
Automation rules are rules that run in the background and match prospects based on certain criteria and perform certain actions. You can use Opportunity fields as criteria or actions in automation rules, such as adding prospects to a list based on their Opportunity stage or updating their Opportunity amount based on their score. Opportunity Reports are reports that show the revenue generated by your marketing campaigns and the influence of your marketing activities on the sales pipeline. You can view the Opportunity Reports in Marketing Cloud Account Engagement to analyze the performance of your marketing efforts and optimize your strategy. Manually editing or deleting the Opportunity in Marketing Cloud Account Engagement are not actions that can be taken, as Marketing Cloud Account Engagement does not allow editing or deleting Opportunities. You can only edit or delete Opportunities in Salesforce, and the changes will sync back to Marketing Cloud Account Engagement. References Opportunities in Marketing Cloud Account Engagement Automation Rules Overview Opportunity Reports