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One Saturday, Lacey was sitting at home when the telephone rang. A local company was making promotional calls and told Lacey she had just won a $1000 gift certificate. She felt a rush of excitement at the thought of what she could do with $1000. Now Lacey finds that whenever she hears a telephone ring, she feels a surge of excitement. In this example, the rush of excitement that Lacey felt when she heard she had won the gift certificate is _________.
a. the unconditioned stimulus
b. the unconditioned response
c. the conditioned stimulus
d. the conditioned response