Explanation
You cannot set up Marketing Cloud Account Engagement yourself to sync with Person Accounts. You need to contact Marketing Cloud Account Engagement support to enable this functionality, as it is not available by default. Person Accounts are a special type of account in Salesforce that combines the attributes of both accounts and contacts. To sync Marketing Cloud Account Engagement with Person Accounts, you need to follow some additional steps, such as enabling Person Account Syncing, creating Person Accounts instead of Leads, and adding Marketing Cloud Account Engagement data to Person Account layouts12 References: 1: Person Account Syncing with Salesforce2: What To Know Before Using Person Accounts in Marketing Cloud Account Engagement & Salesforce

Explanation
According to the Salesforce documentation, when a prospect is added to a suppression list in an engagement studio program, the prospect is paused from receiving any further emails or actions from the program.
However, the prospect's progress in the program is not reset or removed. If the prospect is removed from the suppression list, the prospect will resume the program from where they left off, which is the next step after the last completed step. In this case, the prospect will continue on the engagement studio program onto step 6.
References: Salesforce documentation

For a Salesforce Opportunity to sync to Marketing Cloud Account Engagement, the Opportunity must have a Contact Role that is syncing to a prospect in Marketing Cloud Account Engagement. This means that the Contact Role must be associated with a Contact record that has a Marketing Cloud Account Engagement prospect record. The Opportunity record type, source, or creator are not relevant for the sync1

Explanation
The two steps that you must do in Salesforce to map a Marketing Cloud Account Engagement prospect custom field to a Salesforce field are:
* Add a new custom contact field in Salesforce. A custom contact field is a field that you can create and add to the contact object in Salesforce, which stores the information and activities of an individual person who is associated with an account. You can use custom contact fields to store data that is specific to your business needs, such as industry, product interest, or satisfaction score. You can map a Marketing Cloud Account Engagement prospect custom field to a Salesforce custom contact field, so that the data is synced between Marketing Cloud Account Engagement and Salesforce. To add a new custom contact field in Salesforce, you need to go to Setup > Object Manager > Contact > Fields & Relationships > New, and follow the steps to create the field.
* Add a new custom lead field in Salesforce. A custom lead field is a field that you can create and add to the lead object in Salesforce, which stores the information and activities of a potential customer who is not yet qualified. You can use custom lead fields to store data that is specific to your business needs, such as lead source, lead score, or lead status. You can map a Marketing Cloud Account Engagement prospect custom field to a Salesforce custom lead field, so that the data is synced between Marketing Cloud Account Engagement and Salesforce. To add a new custom lead field in Salesforce, you need to go to Setup > Object Manager > Lead > Fields & Relationships > New, and follow the steps to create the field.

Prospects sync to your CRM when they have been assigned to a user or queue. A CRM is a customer relationship management platform that allows you to manage your sales and customer service operations. You can integrate Marketing Cloud Account Engagement with your CRM using the Salesforce connector, which allows you to sync data, activities, and campaigns between Marketing Cloud Account Engagement and Salesforce. However, not all prospects in Marketing Cloud Account Engagement are synced to Salesforce. Only prospects that have been assigned to a user or queue in Marketing Cloud Account Engagement are synced to Salesforce as leads or contacts. You can assign prospects manually, through automation rules, or through lead assignment rules.
Answer A, C, D, and E are incorrect because prospects do not sync to your CRM when they fill out a form on a landing page, when they have a lead score greater than 50, when they visit a landing page, or when they are created manually in the Marketing Cloud Account Engagement database, unless they are also assigned to a user or queue, as explained above. Reference: [Salesforce Connector], [Sync Prospects with Salesforce]