The answer is letter B. <span>Mexico and the United States.
Since Mexico and United States are geographically close to each other, the policy will affect them relatively more.
Thank you for posting your question. I hope my answer has helped. Feel free to ask me more.</span>
the answer is: The neutral stimulus causes no response.
Without being paired by any situation, neutral stimulus would not mean anything to the subjects. Because of this , the subjects would normally just ignore the neutral stimulus every time they face it.
But, when the neutral stimulus is paired with a certain situation (such as ringing a bell before giving foods to dogs), the dogs will associate the neutral stimulus with the positive reinforcement. To the point where the neutral stimulus transformed into a conditioned stimulus, which make the dogs'mouth to start watering every time they hear the bell.
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