Which of the Following Sentences Would Best Motivate Action in a Persuasive

Which of the following sentences would best motivate action in a persuasive message?

A) We know that you'll want your employees to complete our ethics training program, so sign on the dotted line to begin.
B) We'll drop buy on August 10 so you can sign the contract and begin the training program for all your employees.
C) The ethics training we provide will help employees resolve workplace ethical dilemmas. Please call me by August 1 so that training can begin by August 15.
D) If you think that our ethics training program might benefit your employees, we hope you will consider giving us a call and hiring us.