Novice90 wrote:
Hi,
I have gone through the explanations in the thread below, but still fail to understand the logic:
Option A: "Stress induces both snoring and smoking in certain individuals". Though this option provides a new source that induces snoring apart from smoking, but it does not say anything about people without stress but who smoke. What about these people do they snore or not?
Option D: "Most smokers do not sore". This directly deals with the conclusion. It presents a fact that is exactly opposite of the conclusion. Most smokers do not snore and hence smoking has not induced snoring in many people
Hence, shouldn't the answer be option D?
Thanks!
Yes, there are still smokers whose snoring cannot be blamed on stress, and without further information, we cannot say whether choice (A) actually
disproves the author's hypothesis. However, it certainly
weakens the author's reasoning. The author reasons that since snoring is more common among smokers, smoking
by itself must be causing some people to snore. Choice (A) tells us that at least some of the smokers who snore are snoring because of stress not because they smoke. Perhaps if stress were not a factor, smokers and nonsmokers would be equally likely to snore. But because stress induces smoking AND snoring, the data, on which the hypothesis is based, is misleading.
As for choice (D), the conclusion is that smoking
by itself can induce snoring. This does not say that smoking always or even usually induces snoring. Rather, it says that smoking, by itself,
can induce snoring. The author's hypothesis does not require that most smokers snore. In fact, the passage even states that snoring is not common among smokers. This fact does not impact the author's reasoning, so choice (D) can be eliminated. As long as
some smokers snore, the author's hypothesis is feasible.