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Re: #19- GMATprep [#permalink]
+1 C
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Re: #19- GMATprep [#permalink]
Choice D states that people who use water from private source (that mean this source of water is not contaminated by pollutants) do not normally get the disease. => strengthen.
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Re: #19- GMATprep [#permalink]
IMO C.

C - weakens and all other options support the argument.



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Re: #19- GMATprep [#permalink]
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