Which of the Following Provides the Best Example of Reward

Which of the following provides the best example of reward power?

A) A manager advises an employee that if he or she wants to be promoted, then he or she must be more punctual.
B) A manager writes up an employee for unethical conduct in the workplace and withholds a bonus.
C) A manager advises a subordinate that if he or she passes a licensure exam, then he or she is eligible for a sizable pay increase.
D) A manager threatens an individual with termination for refusing to sign a falsified document.