Which of the following statements best depicts the concept of incentive theory?
A Chelsea was extremely thirsty and drank two bottles of water after running two miles.
B Despite low grades, Fred continues to study because he is interested in the material.
C Kim has not eaten all day; therefore, he daydreams about pizza.
D Michael says that he is constantly hungry and eats at least four meals a day to reduce his hunger.
E Sabrina studies hard because her parents reward her by paying $20 for each superior grade she brings home.