According to the Salesforce documentation, the actions that can be done with the gear icon on the prospect list are: B) Assign, C) Delete, and D) Edit. The gear icon is a feature that allows users to perform different actions on a prospect or a group of prospects from the Prospect List. The gear icon can be accessed from the Prospects tab in Marketing Cloud Account Engagement, and it can show different options for the selected prospect or prospects, such as assign, delete, or edit. The assign option allows the user to assign the prospect or prospects to a user, a group, or a queue. The delete option allows the user to delete the prospect or prospects from Marketing Cloud Account Engagement. The edit option allows the user to edit the prospect or prospects’ information, such as name, email, or custom fields. The copy option is not an action that can be done with the gear icon on the prospect list, as it is not an available option for the prospect or prospects. References: Salesforce documentation