Paul Sets a Goal of Completing the Design for a New

Paul sets a goal of completing the design for a new display box for a major customer by the end of the week. In general, he motivates himself to achieve goals by using self-reinforcement. In this case, Paul practices self-reinforcement by

A) agreeing to take a training course suggested by his manager to improve his confidence at work.
B) doing something he loves, namely playing golf over the weekend, if he is able to complete the project on time.
C) accepting the invitation of co-workers to observe their work, thereby enabling Paul to hone his skills.
D) promising his manager that he will double-check his work to make sure it has been completely correctly.