Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
Scenario I
Tyler is physically dependent on heroin and injects it intravenously multiple times per day.Most often,he uses with his dealer in a drug house on his street.One day when his dealer was out of town,Tyler met a group of fellow users going to a drug party about 2 hours away.Tyler tagged along,and noted that he felt odd injecting the drug in this setting,because the new people and environment were a marked departure from his usual routine.Minutes later,although the drug was of the same quality and he took no more or less than usual,Tyler overdosed and had to be rushed to the emergency room.
-(Scenario I) An account of drug overdose based on classical conditioning differs from typical preparations such as the one first used by Pavlov in that:

A) the conditioned and unconditioned stimuli are of different stimulus modalities.
B) only one trial is necessary for learning to occur.
C) the conditioned response takes the form that is the opposite of the unconditioned response.
D) the conditioned response precedes the unconditioned stimulus.