Ian Is Starting to Eat Baby Food

Ian is starting to eat baby food. He really likes it. Soon he gets really excited when he hears the pop occurs when the sealed bottles of baby food are opened. One day his mom is opening a bottle of mustard pickles. Ian comes running when he hears the pop. Ian's response to the popping of a sealed lid is exhibits that he has _________the popping sound from his baby food bottles.

A) generalized
B) extinguished
C) habituated
D) recovered spontaneously