As a Child, Eva Had a Nightmare About Clowns and She

Multiple Choice

As a child, Eva had a nightmare about clowns and she now feels fearful upon seeing clowns as an adult. One explanation for her fear is that:

A) the nightmare was a CS that produced the CR of fear.
B) clowns are a CS that produce the UR of fear.
C) the nightmare was a US that produced the CR of fear.
D) clowns are a CS that produce the CR of fear.