Please refer to the image. Thanks.
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akhilsuhag
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Hi akhilsuhag,
The logic in this CR question is based on "causality" (the idea that one thing causes another). This is a fairly common logic "construct" on the GMAT and you'll likely see it at least one on Test Day.
The Facts:
-A study followed a group of teenagers WHO HAD NEVER SMOKED and tracked whether they took up smoking (or not) and how their mental health changed.
-After 1 year, the incidence of depression in those who TOOK UP SMOKING was 4 times as high in those who had not taken up smoking.
-Nicotine changes brain chemistry, possibly affecting mood.
Conclusion:
-Smoking likely contributes to depression in teenagers.
The Logic: Based on the given information, it seems logical that smoking probably leads to depression in TEENAGERS WHO HAD NOT PREVIOUSLY BEEN SMOKERS.
Causality is a strict concept - to say that X causes Y, you have to assume that:
1) Something else did not cause Y instead
2) Y didn't cause X
3) It's a coincidence (the 2 things are not related)
To strengthen this argument, we're probably looking for an answer that confirms any of the above assumptions. Answer A confirms that depression didn't cause the teenagers to take up smoking (which confirms the 2nd assumption).
GMAT assassins aren't born, they're made,
Rich
The logic in this CR question is based on "causality" (the idea that one thing causes another). This is a fairly common logic "construct" on the GMAT and you'll likely see it at least one on Test Day.
The Facts:
-A study followed a group of teenagers WHO HAD NEVER SMOKED and tracked whether they took up smoking (or not) and how their mental health changed.
-After 1 year, the incidence of depression in those who TOOK UP SMOKING was 4 times as high in those who had not taken up smoking.
-Nicotine changes brain chemistry, possibly affecting mood.
Conclusion:
-Smoking likely contributes to depression in teenagers.
The Logic: Based on the given information, it seems logical that smoking probably leads to depression in TEENAGERS WHO HAD NOT PREVIOUSLY BEEN SMOKERS.
Causality is a strict concept - to say that X causes Y, you have to assume that:
1) Something else did not cause Y instead
2) Y didn't cause X
3) It's a coincidence (the 2 things are not related)
To strengthen this argument, we're probably looking for an answer that confirms any of the above assumptions. Answer A confirms that depression didn't cause the teenagers to take up smoking (which confirms the 2nd assumption).
GMAT assassins aren't born, they're made,
Rich
