GMAT Critical Reasoning (CR) | Re: A system-wide county school anti-smoki

ankujgupta , the idea is that we want to weaken the implied causal argument by showing some other possible cause for the reduction in smoking. C shows that students may simply be smoking less on campus because it's easier to get away. Perhaps the new program had no effect at all! B tells us that students who seemed to change their habits may not have cut down on their overall smoking, so we can read it as underlying the author's premise. However, it does nothing to help us understandwhy students
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