One Saturday,Adhar Was Sitting at Home When the Telephone Rang

Multiple Choice

One Saturday,Adhar was sitting at home when the telephone rang.A local company was making promotional calls and told Adhar he had just won a $500 gift certificate.He felt a rush of excitement at the thought of what he could do with $500.Now Adhar finds that whenever he hears a telephone ring,he feels a little surge of excitement.What is the conditioned response in this example

A)  the ringing of a telephone 
B)  the news that he had just won a $500 gift certificate 
C)  the surge of excitement he feels whenever the telephone rings 
D)  the rush of excitement he felt when he won the certificate