求助一道逻辑题～求大神解答。

yougsuki · 发表于 2017-12-28 12:40:50

Nearly all adults in the community of amaretti, including pregnant women, engage in ritual fasting throughout Dec AND Jan. A recently completed study has revealed that, on the annual cognitive tests given to Amarelti's first-graders in each of last ten years, nearly 25% of the students scoring in the top fifth of the class, but only about 2% of those scoring in the bottom fifth, were born in November. Because pregnancy lasts nine months, only the mothers of children born in November would not have fasted during the entire pregancies; therefore the ritual fasting must have detrimental effects on developing babies.

which of the following ,if true, most weakens the argument?

A No comparable data are available for students who were in first grade in Amaretti more than 10 years ago

B First-grade students who are absent from school when the cognitive tests are administered do not have the opportunity to take them at a latter time

C Each school grade in Amaretti is composed of students born between NOV 1 of a certain year and Oct 31 of the following year

D In Amaretti, non-cognitive birth defects, such as physical deformities , occur at a much lower rate among babies in Nov than among babies born in other months

E In typical year in Amaretti, between one-fourth and one-fifth of all babies are born in NOV.

正确答案是c。求解析！

[逻辑小分队] 求助一道逻辑题～求大神解答。

所属分类: GMAT考试

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