A Puff of Air on the Surface of Your Eye

Multiple Choice

A puff of air on the surface of your eye will make you blink reflexively. If you hear a buzzer repeatedly just before air is puffed into your eye, eventually you will blink as soon as you hear the buzzer. In this example, the unconditioned stimulus is the

A) eye-blink response to the puff of air.
B) puff of air.
C) buzzer.
D) eye-blink response to the buzzer.