再问og13-97题现在分词的用法

lunvs

97. Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.
(A) at some time in the past our ancestors suffered an event, greatly reducing their numbers
(B) that at some time in the past our ancestors suffered an event that greatly reduced their numbers
(C) that some time in the past our ancestors suffered an event so that their numbers were greatly reduced,
(D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced
(E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,
答案选b
问题是：
A的reducing不可以理解成伴随状语嘛？作为前一句话的结果？看另一个帖子的解释说reducing的逻辑主语需要和主句主语Some anthropologists一致，是这个原因么？

春雨Q

可是RON不是说过句尾COMMA+ING的用法只能用来修饰前面的句子么。。。。

qiuhua01234567

是的，它可以修饰event  也可以修饰some anthropologist，造成歧义，不如从句直接修饰event来的好。