The woodland sub-species were in isolation from contact with humans longer than
either their marsh cousins or the tree-dwelling sub-species.
A. in isolation from contact with humans longer than
B. isolated from contact with humans longer than
C. in isolation from contact with humans longer than were
D. isolated from contact with humans longer than were
E. in isolation and without contacts with humans longer than


The OA is D but i was confused between B and D