Sniffy,the Rat,has Been Taught to Press a Bar in a Cage

Sniffy,the rat,has been taught to press a bar in a cage to receive food.The behavior disappears,though,when Sniffy stops receiving food following bar-pressing.Several days later,Sniffy is placed in the cage again,and he immediately began to press the bar.The reappearance of this response is called ____.

A) reconditioning
B) acquisition
C) instantaneous learning
D) spontaneous recovery