Katie Loves Strong Coffee and Cheerfully Admits That She Depends

Katie loves strong coffee and cheerfully admits that she depends on caffeine to help her wake up every day. One morning, her husband served her two cups of decaffeinated coffee without telling her. Nevertheless, she still felt more alert after drinking the decaffeinated coffee. Katie's alertness after drinking decaffeinated coffee is a(n) :

A) example of higher order conditioning.
B) example of latent learning.
C) operantly conditioned response to the taste and smell of coffee, and other discriminative stimuli.
D) classically conditioned response to the taste and smell of coffee, and other stimuli associated with it