单项选择题

The difference between classical conditioning and operant conditioning is

A.Classical conditioning is based on the consequences of an event while operant conditioning is based on repeated pairings of two events.B.Classical conditioning is based on repeated pairings of two events while operant conditioning is based on the consequences of an event.C.Whether or not the infant likes the rewarD.D.Classical conditioning is uses motor behavior but operant conditioning uses any behavior.