Sentence Correction

In ancient times, Nubia was the principal corridor where there were cultural influences transmitted between Black Africa and the Mediterranean basin.

A . where there were cultural influences transmitted
B . through which cultural influences were transmitted
C . where there was a transmission of cultural influences
D . for the transmitting of cultural influences
E . which was transmitting cultural influences

Ans should be B....

corridor through which.... gives the correct reference...

where there were , for , which dose not make correct reference