Which of the Following Is a Good Example of an Incentive

Which of the following is a good example of an incentive?

A) the tendency to do whatever is necessary to maintain body temperature within narrow limits
B) the tendency for a person with unacceptable sexual impulses to engage in some nonsexual behavior instead
C) the tendency to do little or nothing immediately after a large meal
D) the tendency of a non-hungry person to eat a very attractive and tasty food