The Prologue to Chapter 5 Describes the Story of Erv

The prologue to Chapter 5 describes the story of Erv, whose wife Fern accidentally locks him in the attic. Because of the incident, Erv now experiences a conditioned emotional reaction of fear whenever he must go up in the attic. Erv's initial entrapment in the airtight attic represents the _____, and the fear he experienced on that first occasion represents the _____.

A) conditioned response; unconditioned stimulus
B) conditioned stimulus; conditioned response
C) unconditioned response; unconditioned stimulus
D) unconditioned stimulus; unconditioned response