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A. None of the subjects who refrained from eating bananas with breakfast had previously eaten bananas with breakfast on a regular basis.
B. Eating patterns after breakfast will have a greater effect on acne levels.
C. The researchers who conducted the study plan to verify the results by conducting two similar studies in the future.
D. The intake of vitamin C and fiber, the other major elements found in bananas, has been shown to have no correlation with facial complexion. CORRECT. By ruling out other possibilities, this option confirms that it is indeed potassium that is causing the good effect.
E. Facial washing is an alternative approach to acne treatment.
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Why D and not A?
Isn't A giving support? If no one used this method before and if this method brings results then ?
:D

GMATNinja, nightblade354
Please help!
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GMAT0010
Why D and not A?
Isn't A giving support? If no one used this method before and if this method brings results then ?
:D

GMATNinja, nightblade354
Please help!

The assumption is that potassium causes the good effect. Not the consumption of Banana. Option A deals with Bananas not Potassium

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Official Explanation:
(D) This is a Strengthen question.
The conclusion is that potassium intake can lead to a better facial complexion. (This is based on an observed correlation between eating bananas and a decrease in facial blemishes, but it is important to understand that the conclusion is not that eating bananas is good for the complexion.)
Choice (D) strengthens this conclusion by eliminating the other main nutrients found in bananas, leaving potassium as the nutrient that affects facial complexion.
Providing an alternative method of improving complexion, as given with choice (E), does not affect the stated conclusion either way.
Choice (A) is irrelevant to the study indicators.
Choice (B) indicates that breakfast is not the most important factor in acne control, but it neither confirms nor denies the conclusion about potassium specifically.
Choice (C) is wrong because a plan to do something in the future says nothing about the current study and conclusions drawn from it.
Choice (D) is the correct answer.
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option A is wrong because for it to be true we have to assume that if one stops eating banana's the effect will still be there
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I am not able to find a good and reasonable explanation for this question. kindly explain it in a specified manner!
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option A is wrong because it says - None of the subjects who refrained from eating bananas with breakfast had previously eaten bananas with breakfast on a regular basis.

okay so did they eat bananas at lunch? dinner? brunch? yum yum
okay they didn't eat regularly , what about irregularly ? ;)

takeaway - when down to 2 options , always read every word carefully and try to make sense of it :)
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