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Pharmacists recently conducted a study with respect to the reasons their ... ...

Which one of the following statements, if true, most seriously undermines the pharmacists’ conclusion?
(A) An inherited condition can cause both weak eyesight and dry eyes.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Press: Set C - Premise / Conclusion Practice

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Replies to This Thread: 1 | ----
Pharmacists recently conducted a study with respect to the reasons their ... ... 
Posted: 06/09/2013 07:14
Pls explain why is not C thanks in advance.
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Posted: 07/02/2013 10:47
Rum, C actually weakens the premise. Read carefully. Premise says "wearing contact lenses by itself causes dry eyes". C says "most people with dry eyes do NOT wear contact lenses".
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