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Official Explanation

The satisfaction of customers who shop at the company’s stores has improved, and the company is advertising this fact. Choice (D) provides evidence that these moves are having a positive effect, and suggests that they may result in higher sales: If people who do not shop at this company’s stores think better of the company now than they used to, then there is a possibility that they will be converted to customers of the company. There is no guarantee of this, of course, but there is no other statement that provides stronger support for the argument, so choice (D) is the correct answer in the first column.

Choice (A) seems as though it might weaken the argument, but in fact it does not provide new meaningful information one way or the other: whether or not the previous management team was focused on customer satisfaction, the results are what matters.

Choice (C) basically says that the survey results are statistically valid, but it does not give any further evidence that these results will or will not lead to the conclusion presented in the argument. (If, instead, the statement had said that the survey results are not statistically valid, then it would have been a good candidate for the statement that undermines the conclusion.)

Choice (E) seems tempting, but is ultimately irrelevant: The conclusion says that the company will increase its per store sales, not its overall sales. You have no information on which to judge how the new stores will affect the company’s per store sales. Finally, choice (B) is the one that undermines the argument.

The correct answer is (D).

The conclusion that the company’s per store sales will increase rests partly on the improved customer satisfaction results. Choice (B) says that only a score of 5 in customer satisfaction correlates strongly with increased sales. Therefore, if most of the 75% of respondents who rated their satisfaction a 4 or a 5 in fact rated it a 4, then the force or the survey results, in terms of predicting increased sales, becomes much weaker. [While choice (B) does not tell you what the breakdown of 4s and 5s is, it does give reason to doubt the significance of that 75% figure.]

The correct answer is (B).
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KarishmaB GMATinsight , Would you like to explain this part "Not all customers who shopped at the drugstore chain, but only a representative sample of them, responded to the survey." ?
I dint understand completely what they meant by "representative sample ". Dint pick it either.­ But definitly I would like to know more about its implications.
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"Not all customers who shopped at the drugstore chain, but only a representative sample of them, responded to the survey."
Isnt this statement strengthening the argument by not letting us think of an alternate weakener, of the sample not being representative? Its strengthening the validity of the survey

Whereas "A separate survey among consumers who do not habitually shop at this company’s stores shows that most of them have an improved opinion of the company now compared to a year ago." just tells us that the image fo the company has improved, which has been implicitly stated in the question, given that the ratings have improved, so how is it strengthening anything
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