Which of the Following Would Be the Most Effective Closing

Multiple Choice

Which of the following would be the most effective closing statement in a routine action request letter?

A) Because we must train employees on the new accounting software prior to the start of our fiscal year, please install the software by February 1.
B) We hope to have the accounting software installed by February 1.
C) Thanking you in advance for installing the accounting software by February 1.
D) I would appreciate your installing the software as soon as possible.