Explanation: It is not possible to create a dynamic list of all prospects who have accessed a certain file in Marketing Cloud Account Engagement. Dynamic lists are based on criteria that match prospect fields, not prospect activities. Therefore, you cannot use a dynamic list to segment prospects based on whether they have downloaded a file, watched a video, or visited a page. Option A is not correct because field value mapping has nothing to do with dynamic lists or file access. Option C is not correct because match type is irrelevant for this question, as there is no valid criterion for file access. Option D is not correct for the same reason as option C.