Which of the Following Statements About Forms of Variable Pay

Which of the following statements about forms of variable pay are true?

A) Profit-sharing plans are based on the concept that intrinsic rewards are more motivating than extrinsic rewards.
B) Profit-sharing plans are also called piece-rate plans.
C) Gain-sharing is a motivational plan based on group productivity.
D) Stock options are a category of job-sharing pay plans.
E) A bonus is simply a one-time payment of a piecework rate.