Burt had never been afraid of spiders. but at camp last summer he woke up and there was a spider on his face. Since this event, he cries in fear every time he sees a multi legged creature. For Burt, before the incident spiders had been a ______, after the incident, spiders are a ______.
A) neutral stimulus; conditioned response
B) unconditioned stimulus; unconditioned response
C) conditioned stimulus; unconditioned stimulus
D) neutral stimulus; conditioned stimulus
E) conditioned stimulus; conditioned response
Answer: D