Ed Noticed That Whenever He Used His Electric Can Opener,his

Multiple Choice

Ed noticed that whenever he used his electric can opener,his cat would come into the kitchen and act hungry-drooling and mewing pitiably.He reasoned that because he used the can opener to open the cat's food,the sound of the can opener had become a/an:

A) unconditioned stimulus.
B) conditioned stimulus.
C) conditioned response.