When brett was only six years old, his older sister hid in his closet, then unexpectedly jumped out and scared him when he came into his dark bedroom. as an adult, brett is still terrified of the dark. based on principles of classical conditioning, brett's current fear of the dark is ?

I believe the answer is : conditioned response.

conditioned response refers to the type of response that created by training/exposing the subject to rely a certain way when facing a certain trigger.

In the scenario above, the feeling scared of dark is created because the parents conditioned Brett to believed that something scary would come and get them in the dark