Hi Shraddha,
The following question has earlier been explained by you. However, I have some clarification to seek.
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
The reason why Option A is incorrect is that the subject of the preceding clause ie. "ancestors" is wrongly credited with the action of 'reducing their numbers". it should correctly be attributed to the "event", as evident in Option B.
However, as per my understanding, Verb+ing modifiers do the following:
1. presents additional info about the preceding clause(not about the subject of the clause)
2. presents the results of the preceding clause(not about the subject of the clause)
Thus how is the above reasoning to discard option A correct?
Waiting for your wonderful insight.
Regards
Argha