When using positive reinforcement,the principle of ____ states that the reinforcer must be administered only if the desired behavior is performed.

A) reinforcement size
B) contingent reinforcement
C) immediate reinforcement
D) reinforcement deprivation

Contingent reinforcement refers to administering the reinforcer (reward or praise) only if the desired behavior is performed. This means that the reinforcement is contingent upon the behavior, and it helps to strengthen the likelihood of that behavior being repeated in the future. Immediate reinforcement (C) means that the reinforcer should be administered as soon as possible after the desired behavior is performed. Reinforcement size (A) refers to the amount or magnitude of the reinforcement, while reinforcement deprivation (D) refers to the period of time during which the individual has not received the reinforcement. While both A and D are important factors to consider in reinforcement, neither specifically addresses the requirement of only administering the reinforcement for the desired behavior.