"Why Not Send a Cheque Today?" Is a Poor Ending

Multiple Choice

"Why not send a cheque today?" is a poor ending for a direct mail letter.Why?

A) Questions aren't a good idea in a direct mail letter.
B) The question lacks you-attitude, and therefore seems obnoxious.
C) The question lacks positive emphasis, and therefore encourages a "no."
D) This question makes the action sound too easy, and won't grab a reader's attention.