In Order to Teach an Animal to Salivate When Only

Multiple Choice

In order to teach an animal to salivate when only a certain tone is played, you must

A) sound the tone and present the food when the dog salivates correctly.
B) present food before every tone, but let the animal eat it only when it's the right tone.
C) only pair food with the one tone you want the animal to salivate to.
D) pair the food with all the tones, but add noxious substances to it when ringing the wrong tone.