Ivan Pavlov Conducted a Series of Studies That Led Him

Ivan Pavlov conducted a series of studies that led him to propose his theory of classical conditioning. In these studies, Pavlov observed how a dog learned to:

A) Bark when meat was presented
B) Bark when meat was taken away
C) Wake up when an auditory stimulus (e.g., a bell) was presented
D) Salivate to a simple stimulus such as a light or bell