Ivan Pavlov was the theorist who coined the term classical conditioning after he noticed his dog salivated each time he entered the room, even before presenting food. Pavlov went on to pair the sound of a bell with salivation, which demonstrated learning by pairing a conditioned stimulus with an unconditioned stimulus. The other theorists are incorrect choices. Skinner and Thorndike are associated with operant/instrumental conditioning. Watson is also associated with classical conditioning, but is famous for his Little Albert study.
