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Tamica met her boyfriend last year while eating popcorn at the mall. She and her boyfriend feel very happy together. Since that time, whenever Tamica eats popcorn, she feels happy. Tamica’s feeling of happiness when eating popcorn is the:
a. unconditioned stimulus (UCS).
b. conditioned stimulus (CS).
c. unconditioned response (UCR).
d. conditioned response (CR).
What is d. conditioned response (CR).