Billy Is Offered Five M&Ms and Is Told That If

Multiple Choice

Billy is offered five M&Ms and is told that if he can wait and not eat these M&Ms for ten minutes, he can have 15 M&Ms. Unfortunately, after waiting for only a couple of minutes, the M&Ms start to look too delicious, so Billy goes ahead and eats them. Based on this example, psychologists would most likely say that Billy has yet to learn:

A) delay of gratification.
B) stimulus discrimination.
C) effective modelling.
D) stimulus generalization.