It is not rare in that people in fifties are going to university for further education.
A. 90s; the
B. the 90s; 不填
C. 90s; their
D. the 90s; their
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A. 90s; the
B. the 90s; 不填
C. 90s; their
(答案→)D. the 90s; their
解析：表示在几十年代，在以 ty 结尾的复数基数词前加 the; 表示在某人几十多岁时，用 one’s 加以 ty 结尾的复数基数词。