237. It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
(C)are because of the interaction between two stars that orbit each other
(E)are caused by the interaction of two stars orbiting each other
答案E 我知道E很不錯
可是我不明白 C錯的點
請指點