A recent study found that snoring, though not common in either group, is more common among smokers than among nonsmok...

emilydemmer April 1, 2020

Why is A correct?

Is A correct because it introduces an alternate cause?

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Skylar April 12, 2020

@emilydemmer, happy to help!

(A) is correct because it introduces an alternate cause for both snoring and smoking, which suggests that the passage confused correlation with causation.

Does that make sense? Please let us know if you have any additional questions!