Pavlov Placed Meat Powder in the Mouths of the Dogs

Multiple Choice

Pavlov placed meat powder in the mouths of the dogs, and they began to salivate. Pavlov's student noticed that after a few days the dogs began to salivate at the sound of the student's footsteps. The salivation to the sound of the
Footsteps was a __________

A) primary reinforcer.
B) positive reinforcer.
C) conditioned response.
D) secondary reinforcer.