Grayson's Dog Salivates Each Time He Hears the Fridge Door

Multiple Choice

Grayson's dog salivates each time he hears the fridge door open. Grayson decides to try an experiment. He sets up several trials where his dog salivates upon hearing the fridge door open but does not receive any food. As a result, the dog stops salivating when the fridge door is opened. What happened?

A) dog realizes that the bell is not food
B) extinction has occurred
C) contingency loop has been disrupted
D) spontaneous recovery was not triggered