The woodland sub-species

[subhajeetcool]

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

OA is D. Can anybody help me why B is not correct?

[jnelson0612]

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

OA is D. Can anybody help me why B is not correct?

What is the original source for this question? Also, I think that in the original sentence the word "in" should also be underlined. Thanks!

[subhajeetcool]

Hi Jamie,
Again I got this question from http://gmatclub.com/forum/the-woodland- ... 25004.html

[jnelson0612]

Hi subhajeet,
As I said in the thread for the other question, unfortunately we are required to obtain original sources for all problems we tackle; we'll be unable to help further unless you can obtain the original source for this problem. Otherwise, we run the risk that this is actually an official GMAT problem, and those are banned on this site. Sorry. :-(