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Answer:
(A) Participants who were depressed at the start of the study were no more likely to be smokers after one year than those who were not depressed.
Explanation:
This strengthens the argument, because depression doesn´t correlates directly with smoking, it rejects the idea of the Cause-Effect, that would say that maybe depression causes people to turn to smoking to deal with it, so if people were already depressed when entered the trial and weren´t more likely to those who didn´t to start smoking this eliminates that possibility.
