Regarding the Size of a Reinforcer, It Should Be Understood

Regarding the size of a reinforcer, it should be understood that

A) the significance of the size of a reinforcer varies with each individual.
B) reinforcers must always be large in order to be effective.
C) the size of the reinforcer is not what is important, it is the timing of the reinforcer.
D) the larger the amount of the reinforcer, the less effect it will have on the frequency of the desired behavior.