Jeremy stops gambling five minutes after his slot machine last paid off; Jessica is still gambling, even though her slot machine hasn't paid off in over an hour. In this example, Jeremy's behavior __________ while Jessica's behavior __________.
a. is controlled by conditioned stimuli; is controlled by unconditioned stimuli
b. shows low resistance to extinction; shows high resistance to extinction
c. has been classically conditioned; has been operantly conditioned
d. shows high resistance to extinction; shows low resistance to extinction