求教牛牛们

sasha_wen

New theories propose that catastrophic impacts of asteroids and comers may have caused reversals in the Earth's magnetic field,the onset of ice ages ,splitting apart continents 80 million years ago, and great volcanic eruptions.
A splitting apart continents
B the splitting apart of continents
C split apart continents
D continents split apart
E continents that were split apart
为什么答案选B,求详解，谢谢！

sasha_wen

谢谢指导

cynthia627

这个是并列嘛~ the splitting apart of continents和the onset of ice ages什么的都是并列的。所以就是B咯~