Pavlov Placed Meat Powder in the Mouths of Canine Subjects

Multiple Choice

Pavlov placed meat powder in the mouths of canine subjects and they began to salivate.His student noticed that after being brought to the laboratory a number of times,the dogs would begin to salivate at the sound of the person's footsteps.The salivation to the sound of the footsteps was a/an:

A) unconditioned response.
B) unconditioned stimulus.
C) conditioned response.
D) conditioned stimulus.