they talk about the problem among

题目

they talk about the problem among
A.them B.each other C.themselves D.himself
请哪位高手帮忙指点下,具体解释下

答案

C
themselves他们自己
each other 指（2者间）相互,among则指3者或更多间,故among后不合适each other
himself,他自己,主语是他们,不合适