Theresa was very nervous as she stepped up to the free-throw line in her first college basketball game. She carefully bounced the ball three times, snapped her gum twice, and tossed the ball. It sailed in for a basket. Now Theresa ensures that she bounces the ball exactly three times and snaps her gum before every free throw, and she makes about 70% of her shots. Based on what is known about

operant conditioning, you should conclude that Theresa's behavior best illustrates the concept referred to as:

a. adventitious reinforcement
b. successive approximations
c. classical conditioning
d. the Premack principle

A