Mr. Sampson's mouth always waters when he sees a donut. He nearly always orders a coffee when he has a donut. One day, he orders a coffee and a chocolate donut. He is served the coffee right away, but told that the donuts are still being made and he wil have to wait a few minutes. He takes a seat while he is waiting and takes a deep sniff of his coffee. As he does so, he begins salivating. In terms of classical conditioning, why did this happen?
a. It happened because the coffee is acting as a conditioned stimulus.
b. It happened because the coffee is acting as an unconditioned stimulus.
c. It happened because the coffee is acting as a conditioned response
d. It happen the use the coffee is acting as an unconditioned response.

In classical conditioning, a conditioned stimulus (CS) is associated with a positive or negative consequence: an unconditioned stimulus (US). This provokes a psychological or physiological reaction, known as conditioned response (CR).

In the example, the smell of coffee is the conditioned stimulus, the donuts are the unconditioned stimulus and the salivation is the conditioned response.

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