Harmony Notices That Her Cat Salivates as Soon as It

Multiple Choice

Harmony notices that her cat salivates as soon as it hears the sound of Harmony opening a can with an electric can opener. In this example, the ________ is the conditioned stimulus.

A) can of cat food
B) sound of the electric can opener
C) dish that Harmony puts the food in
D) cat scurrying into the kitchen