An Effective Ending for a Persuasive Message Would Be

An effective ending for a persuasive message would be:

A) Please respond as soon as possible because this offer is not likely to last very long.
B) Simply take the enclosed coupon to any of our service centers by June 15 for your free oil and filter change.
C) Wouldn't you like to save some money?
D) Be sure to tell all your friends about this exciting offer.