Correct answer is A
From Salesforce help-article: "For example, a Northern Trail Outfitters marketer wants to create personalized email sends to their contacts using the names of specific customer service representatives. While the content of the send is the same for all recipients, the marketer wants the From Name to be customized for each recipient. The marketer creates FromName and FromEmail attributes in the Marketing Cloud for the customers to hold the From information they want to include in the send. These attributes correspond to fields in the Sales Cloud. Then the marketer creates a sender profile that uses AMPscript to dynamically pull information from the subscriber attributes populated by Sales Cloud information. If no attribute information is present, the sender profile uses system default information."

Source: https://help.salesforce.com/s/articleView?id=sf.mc_co_dynamic_sender_profile.htm&type=5