Bart Developed a Severe Fear of Flying When He Was

Multiple Choice

Bart developed a severe fear of flying when he was piloting a small plan through some severe turbulence.He has been seeing a therapist,and it appears that his fear response has been successfully extinguished.The therapist used a flight simulator to help Bart practice his piloting skills in a safe setting.However,the first time Bart stepped back into a real plane,his fear returned.This example illustrates the phenomenon known as

A) second-order conditioning.
B) the renewal effect.
C) unblocking.
D) stimulus generalization.