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Read the claim.
CLAIM: Smoking causes lung cancer.
Which statement of evidence best supports this claim?
Select one:

10 to 15 percent of all lung cancer victims are non-smokers.

Smokers are 23 times more likely to develop lung cancer than non-smokers.

Even people who smoke fewer than five cigarettes a day can develop health problems.

Smoking doubles the risk of heart failure among both men and women.

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Answer:

Even people who smoke fewer than five cigarettes a day can develop health problems.

Smoking doubles the risk of heart failure among both men and women
The answer is the second one: "Smokers are 23 times more likely to develop lung cancer than non-smokers."

This is the right answer because it is the only one that directly relates smoking to lung cancer.