Sue Noticed That Whenever She Opened the Door to the Pantry

Multiple Choice

Sue noticed that whenever she opened the door to the pantry, her dog would come into the kitchen and act hungry, by drooling and whining. She thought that because the dog food was stored in the pantry, the sound of the door had become a(n) __________

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