A recent study found that snoring, though not common in either group, is more common among smokers than among non-smokers. On the basis of this evidence, the author hypothesized that smoking by itself can induce snoring.
Which one of the following, if true, casts the most doubt on the author’s hypothesis?OPTIONS
[A]. Stress induces both snoring and smoking in certain individuals.
[B]. Obesity induces many individuals to smoke.
[C]. Most snorers do not smoke.
[D]. Most smokers do not snore.
[E]. Both smoking and snoring cause throat problems.
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