Dr. meyer is known for his difficult pop quizzes. typically, before he conducts a pop quiz for his students, he shuts the classroom door. students soon learn to anticipate a pop quiz whenever dr. meyer closes the classroom door. in this case, closing the door has become a(n)

The door has become a conditioned stimulus where in it is a response or a trigger in a conditioned response. It is like because of door closing, it will be a conditioned stimulus in which it will trigger the conditioned response which the response would be the pop quiz for the door indicated the stimulus that is going to happen in the classroom.