SAT的语法题目,为什么A的them不对呢?是代词没有指代吗?如果改成those算不算还是没有指代呢?谢谢大家啦

题目

SAT的语法题目,为什么A的them不对呢?是代词没有指代吗?如果改成those算不算还是没有指代呢?谢谢大家啦
At least one course in statistics is recommended for them(A) who plan to become(B) journalists, because they will often need to evaluate whether information based on(C) statistics is dispensable(D). no error (E)

答案

them只能用在简单句里；如果做从句的先行词,必须是those.
定义从句的引导词who指代的就是those.
代词的宾格（them等）是特指某人 ,
已经特指的话,就没必要再用定语从句修饰了.
换句话说,定语从句的先行词,不能是代词的宾格 .