(C)38.A Friend of ______ says he prefers the version of ..

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them是they的受格
主词+动词+受词
前面没有主词和动词所以不能用them

这几天在看英文文法，对这题也不太懂
不晓得是否能作如此解释:所有代名词
A Friend of ______ says he prefers the version of the Christmas story written by Henry.
A Friend of their friends says he prefers the version of the Christmas story written by Henry.
A Friend of theirs says he prefers the version of the Christmas story written by Henry.