Which of the Following Is True of Reward Power

Which of the following is true of reward power?

A) Effective managers use their reward power sparingly.
B) Effective managers use rewards in a controlling manner, signaling to subordinates that the manager has the upper hand.
C) Managers who exercise coercive power more often than reward power create a tension-free work environment.
D) Being able to give or withhold rewards based on performance allows managers to have a highly motivated workforce.
E) The use of reward power seldom produces high performance and is questionable ethically.