During her summer vacation, Bobby took her new puppy for a walk every morning. Whenever the puppy noticed Bobby tying her shoelaces, it got excited. Once the school reopened, Bobby wore shoes every morning and the puppy got excited. However, Bobby but did not take the puppy for a walk. After a few days, the puppy stopped responding to the sight of Bobby tying her shoelaces. In the context of classical conditioning, the given scenario most likely exemplifies:
A) Stimulus generalization
B) Stimulus discrimination
C) Extinction
D) Spontaneous recovery