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Sales rep: 'Customers prefer X.' Weakens it most:

AX has loyal customers.
BSales rose anyway.
CSurvey method oversampled X buyers.
DMarketing was constant.
Answer & Solution
Correct answer: C. Survey method oversampled X buyers.
1. Biased sample undercuts the claim. _Source: 501-GMAT-Questions Ch 2 Critical Reasoning_
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