What Discovery Sparked Pavlov's Interest in the Phenomenon That Eventually

Multiple Choice

What discovery sparked Pavlov's interest in the phenomenon that eventually became known as classical conditioning?

A) Dogs that were repeatedly restrained while shocked displayed learned helplessness.
B) Dogs displayed exploratory behavior when the experimenter was not in the room.
C) Dogs displayed a reflexive response before the stimulus was presented rather than after it was presented.
D) Dogs became hypersensitive to sounds, such as ringing bells and footsteps.