Question: Branella, a scientist, has found that people will flinch whenver they hear a very loud sound. In her lab, she flashes a red light everytime that she presents a loud sound to a subject. After a while, the subject will flinch after seeing the red light flash, even if no loud sound occurs. In this learning, Branella used the loud sound as a(n) A. conditioned stimulus. B. unconditioned response. C. conditioned response. D. unconditioned stimulus.