. The proportion of women among students enrolled in higher education programs has increased over the past decades. This is partly shown by the fact that in 1959, only 11 percent of the women between twenty and twenty-one were enrolled in college, while in 1981, 30 percent of the women between twenty and twenty-one were enrolled in college.
To evaluate the argument above, it would be most useful to compare 1959 and 1981 with regard to which of the following characteristics?
(A) The percentage of women between twenty and twenty-one who were not enrolled in college
(B) The percentage of women between twenty and twenty-five who graduated from college
(C) The percentage of women who, after attending college, entered highly paid professions
(D) The percentage of men between twenty and twenty-one who were enrolled in college（D）
(E) The percentage of men who graduated from high school
答案是D，我不明白的是，为什么D选项要把男学生也限制在20-21岁。
比如说1959年，20-21的女学生有11%，22-30的女学生有80%，20-21的男学生有1%；然后1981年，20-21的女生有30%。22-30的女生有1%，剩下的全是男的，这样根本不能the proportion of women是多了还是少了阿？
题目问的是women，总不能除了20-21的就不叫women了吧？
欢迎批评指点，多谢
女生的招生（在总体20-21岁的年龄段的）比例：增加
如果男生的（相同20-21岁年龄段的）比例：也是增加。
则说明是招生的人数增加了，使得女生的数量在上升，但是由于男生的数量也会上升，这样女生的比例并不会因此增加。
一个是总体人群的比例，一个是在校学生的比例
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