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A chemical company claims that, since only one of 520 rats

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Director
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A chemical company claims that, since only one of 520 rats [#permalink] New post 19 Jan 2005, 18:49
A chemical company claims that, since only one of 520 rats that were given high doses of a new artificial sweetener developed cancer while all the others remained healthy, the sweetener is not carcinogenic for human beings and ought to be approved for human consumption.
Which of the following, if true, most strongly supports the chemical company’s claim?
(A) Chemicals that are carcinogenic for rats are usually also carcinogenic for other animals, such as guinea pigs, used in experiments.
(B) The spontaneous incidence of cancer in this particular strain of rat is approximately one in 540.
(C) Tests conducted on a certain strain of mouse show that, of 500 mice given a dose of sweetener similar to that given the rats, 53 developed cancer.
(D) Certain chemicals that are carcinogenic for human beings have been shown not to be carcinogenic for rats.
(E) The average lifespan of the strain of rat used in the experiment is 2 years; the chemical company terminated the experiment when the rats were 13 months old.
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 [#permalink] New post 19 Jan 2005, 20:49
I will take B
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 [#permalink] New post 19 Jan 2005, 21:10
talk2sunder@gmail.com wrote:
I will take B

can you please explain why B?
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 [#permalink] New post 20 Jan 2005, 06:48
A - Irrelevant to the discussion
B - Supports the claim becos it now shows only 1 in 540 is affected instead of the 1 in 520
C - Weakens
D - Weakens
E - Irrelevant
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 [#permalink] New post 20 Jan 2005, 08:31
OA is B.
  [#permalink] 20 Jan 2005, 08:31
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A chemical company claims that, since only one of 520 rats

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