well, because it solves the discrepancy between the 2 results, and the question is asking which answer choice does not.
E shows that the reason the people saw no difference in the 2nd test is because many of them were smokers, showing that smoking has an affect on why they saw no difference, meanwhile in the first test, there are less smokers, which shows why there were better results for them. It is solving the discrepancy by showing there is an explanation for the results of both.
D provides information that has no effect on the argument at all, Basically, so what if some participants had a placebo in the 2nd test? How does this explain the difference in results between the 1st and 2nd test? it does not and therefore is the right answer. Hope this helps!
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well, because it solves the discrepancy between the 2 results, and the question is asking which answer choice does not.
E shows that the reason the people saw no difference in the 2nd test is because many of them were smokers, showing that smoking has an affect on why they saw no difference, meanwhile in the first test, there are less smokers, which shows why there were better results for them. It is solving the discrepancy by showing there is an explanation for the results of both.
D provides information that has no effect on the argument at all, Basically, so what if some participants had a placebo in the 2nd test? How does this explain the difference in results between the 1st and 2nd test? it does not and therefore is the right answer. Hope this helps!