Jack and Jill Lived on a Hill in an Apartment

Multiple Choice

Jack and Jill lived on a hill in an apartment with a very static-y carpet. Whenever Jack kissed Jill, she got a shock. Eventually, every time Jack moved toward Jill, she ran down the hill. The shock was a(n)

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