Dr. meyer is known for his difficult pop quizzes. immediately before he announces a pop quiz to his students, he walks to the classroom door and closes it. his students soon learn to anticipate a pop quiz whenever dr. meyer closes the classroom door. in the context of classical conditioning, closing the door has become a(n) conditioned stimulus unconditioned stimulus unconditioned response conditioned response

Ascientist successfully predicts the outcome of an experiment. you watch carefully and know he didn't cheat. the scientist's success shows that: a) the scientist knows absolute truth about this experiment; success is not possible unless you know the truthb) the scientist was just lucky; no one ever knows what's going on, so successful predictions require luckc) the scientist may know the truth, or at least know something that is close to the truth, or the scientist may have gotten lucky this time; you can't be absolutely sured) the scientist really was cheating, even though you didn't see the cheating; no one can get things right, except by cheatinge) the scientist spent the night at a particular hotel chain and go a free breakfast, giving the scientist the ability to do amazing things