Tarik Trained His Pet Turtle to Snap His Mouth in Response

Multiple Choice

Tarik trained his pet turtle to snap his mouth in response to the command "snap!" by saying the word just before giving his turtle a treat.However,after saying "snap!" multiple times while showing off his turtle's new trick to all his friends and not giving him a treat,Tarik has noticed the turtle has stopped snapping.This change in behaviour is likely explained by

A) extinction.
B) spontaneous recovery.
C) discrimination.
D) generalization.