Bob’s favorite grocery store has a machine above the entrance and exit. Every time the automatic door opens, the machine blows air down to keep insects from entering. The air always makes Bob’s eyes blink shut when the air hits them. Now that Bob has been going to this store for years, as soon as the automatic door starts sliding open Bob’s eyes blink automatically. Bob’s eye closing behavior during this scenario is a(n)

A. Unconditioned Response
B. There isn’t enough information to decide
C. Conditioned response
D. Unconditioned stimulus