It's not rare in _______people in fifties are going to the university for further educationA.90s,/ B.the 90s,/ C.90s,their D.the 90s,their最好说下为什么~

It's not rare in _______people in fifties are going to the university for further educationA.90s,/ B.the 90s,/ C.90s,their D.the 90s,their最好说下为什么~
It's not rare in _______people in fifties are going to the university for further education
A.90s,/ B.the 90s,/ C.90s,their D.the 90s,their
最好说下为什么~

It's not rare in _______people in fifties are going to the university for further educationA.90s,/ B.the 90s,/ C.90s,their D.the 90s,their最好说下为什么~
D
首先 AB 排除 因为 for 后面 肯定要跟 their 表达特指前面提到的 in...people 这群人,特指前面提到的人 用their来代替,避免重复 ,所以考虑 c 或者D
in the 90s 固定搭配 90年代.