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