问feifei逻辑的一题，还没想明白

17. Psychologist: Some astrologers claim that our horoscopes completely determine our personalities, but this claim is false, I concede that identical twins---who are, of course, born at practically the same time---often do have similar personalities. However, birth records were examined to find two individuals who were born 40 years ago on the same day and at exactly the same time---one in a hospital in Toronto and one in a hospital in New York. Personalities of these two individuals are in fact different.

Which one of the following is an assumption on which the psychologist’s argument depends?

A.        Astrologers have not subjected their claims to rigorous experimentation.

B.        The personality differences between the two individuals cannot be explained by the cultural difference between Toronto and New York.

C.        The geographical difference between Toronto and New York did not result in the two individuals having different horoscopes.

D.       Complete birth records for the past 40 years were kept at both hospitals.

E.        Identical twins have identical genetic structures and usually have similar home environments.

为什么选c不选b？

horoscopes 的要素(前提):出生时间.

P的研究增加了一个要素(前提):出生地点,地理位置.所以他的假设就一定要是地理位置的不同不会对性格有影响.选C.

 反之,他找到的试验对象,虽然出生时间一样,但是性格差异也有可能是地理位置造成的,就不能说明星象(时间)不是决定因素了.

B的文化差异属于新概念了,而且与出生时间的对应关系不过强.

哦明白了 c肯定取非削弱了 b没有