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# A study followed a group of teenagers who had never smoked

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Manager
Joined: 21 Feb 2012
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A study followed a group of teenagers who had never smoked [#permalink]

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21 Apr 2012, 04:37
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A study followed a group of teenagers who had never smoked and tracked whether they took up smoking and how their mental health changed. After one year, the incidence of depression among those who had taken up smoking was four times as high as it was among those who had not. Since nicotine in cigarettes changes brain chemistry, perhaps thereby affecting mood, it is likely that smoking contributes to depression in teenagers.

Which of the following, if true, most strengthens the argument?

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.
B. The study did not distinguish between participants who smoked only occasionally and those who were heavy smokers.
C. Few, if any, of the participants in the study were friends or relatives of other participants.
D. Some participants entered and emerged from a period of depression within the year of the study.
E. The researchers did not track use of alcohol by the teenagers.

[Reveal] Spoiler: OA
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21 Apr 2012, 19:48
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21 Apr 2012, 21:17
Choice A is the answer. It distinguish the incidence of unfair subjects. The subjects in this study are representative.
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Re: A study followed a group of teenagers who had never smoked [#permalink]

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19 May 2017, 07:06
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: A study followed a group of teenagers who had never smoked   [#permalink] 19 May 2017, 07:06
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