In an Experiment on Classical Conditioning, a Tone Is Followed

Multiple Choice

In an experiment on classical conditioning, a tone is followed by a puff of air to the eyes. After several repetitions, subjects blink their eyes when they hear the tone. In this experiment blinking is

A) the unconditioned stimulus.
B) both the conditioned stimulus and the unconditioned stimulus.
C) the unconditioned response.
D) both the conditioned response and the unconditioned response.