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单选题
（3）Which of the following can explain Dr Obel’s opinion that the ultimat cause is adaptive rather than pathological?
A 47% of children born to women in the top quartile of stress were males while 52% in the bottom quartile.B Women in rich countries are more likely to give birth to boys.C Women selectively abort boys rather than waste time and resources on bringing them to term for fear of male competition.D Women who suffer from calamity in conception are more likely to give birth to girls.正确答案: C可在小程序上查看本题解析，扫码查看
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