Final answer:
Behavioral contrast occurs when changing contingencies of reinforcement on one schedule affect reinforced behavior on another schedule.
Step-by-step explanation:
The correct answer is A) Behavioral contrast.
Behavioral contrast occurs when changing the contingencies of reinforcement on one schedule affect reinforced behavior on another schedule. This means that a change in the reinforcement conditions for one behavior leads to a change in the behavior of a different schedule. For example, if a student is receiving reinforcement for completing math homework and the reward is changed or removed, their behavior may also change in another subject like English.