When He Was a Kid, Samuel Was Once Mugged in a Dark

Multiple Choice

When he was a kid, Samuel was once mugged in a dark alley near his house. Even as an adult, whenever he walks in a dark alley, his palms start to sweat and his heart races. He feels nervous and scared. Samuel's behavior is an example of ________.

A) dark adaptation
B) operant conditioning
C) learning by association
D) habituation