Anthony Classically Conditioned His Cat to Purr Whenever the Phone

Multiple Choice

Anthony classically conditioned his cat to purr whenever the phone rang.One day,the phone rang for nearly two hours straight when Anthony wasn't home,and the cat's conditioned purring response underwent extinction.Today,the response has spontaneously recovered,but what should Anthony expect if the conditioned purring response were to undergo extinction again

A)  It would take more time to extinguish than it took for the original extinction. 
B)  It would take less time to extinguish than it took for the original extinction. 
C)  It would take the same amount of time to extinguish as it took for the original extinction. 
D)  It would be impossible to extinguish the response now that spontaneous recovery has occurred.