Pavlov Paired the Sound of a Metronome with Meat Powder

Multiple Choice

Pavlov paired the sound of a metronome with meat powder in a dog's mouth.As a result,the dog started salivating to the sound of the metronome.Later,Pavlov presented the metronome without the meat powder.Eventually,the dog quit salivating when it heard the metronome.Days later when the dog heard the metronome again,it salivated again.This is an example of:

A) higher order conditioning
B) stimulus control
C) resurgence
D) spontaneous recovery