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.