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CR- damaging the argument

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by tuanquang269 » Sun Dec 11, 2011 8:24 am
bharti.2010 wrote:OA: C
Explanation:-
Conclusion- New lifeguard was not a factor in the declining of death from last year to this year.
C rules out one other possible explantion for the decline in the number of drownings, in turn rendering it more likely that the addintional lifeguard did contribute to the decline.

Chieftang@ this question is little bit modified to make it short but the meaning is same as given in the book.
Can you post explain for other choices. I understand why (C) is correct, but I want to know more about the explanation why choice (D) is incorrect.
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