Shamir Reflexively Kicks His Leg When the Doctor Taps Him

Multiple Choice

Shamir reflexively kicks his leg when the doctor taps him on the knee.Then,the doctor begins saying the word "Help" and then tapping Shamir on the knee.After forty-five trials of first saying "Help," followed immediately by tapping the knee,on the forty-sixth trial,Shamir kicks his leg after hearing the word "Help." In this example,the word "Help" is the ____,and Shamir kicking his leg in response to the word "Help" is the ____.

A) unconditioned stimulus; unconditioned response
B) unconditioned stimulus; conditioned response
C) conditioned stimulus; unconditioned response
D) conditioned stimulus; conditioned response