A Colleague Has Suggested That You Down-Edit Your E-Mail Message

A colleague has suggested that you down-edit your e-mail message when replying to be more efficient. What should you do?

A) You should insert your responses to parts of the incoming message, and include only those parts of the incoming message to which you are responding.
B) You should place your reply at the bottom, after the original message.
C) You should delete the original message altogether before adding your reply.
D) You should write your reply using all lowercase letters.