What Is the Major Advantage of Personal Selling Over Advertising

What is the major advantage of personal selling over advertising as a communication method?

A) Personal selling generates more sales per dollar invested.
B) Personal selling improves the image of the firm.
C) Personal selling activates the receiver's selective processes,and advertising does not.
D) Personal selling results in sales responses that are more difficult to measure than advertising is.
E) Personal selling is more persuasive because the communicator can judge the sales prospect and modify his or her message accordingly.