Professor Kraig Is Known for His Difficult Pop Quizzes,which Naturally

Multiple Choice

Professor Kraig is known for his difficult pop quizzes,which naturally make the students feel anxious.Immediately before he springs a quiz on his students and they start to feel anxious,he always shuts down his laptop to remove his lecture slides from the overhead screen.Students soon notice that they start to feel anxious when Professor Kraig reaches for his laptop and shuts it down.In terms of classical conditioning,Professor Kraig closing his laptop is a(n) _______.

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