The so-called Arctic Ocean, which many oceanographers consider no

Dear csaluja,

I'm happy to respond.

My friend, I don't have the highest opinion of this question. The non underlined part makes the "due to" mistake. Also, this question would be ridiculously easy for native speakers, perhaps challenging only for non-native speakers. This is NOT the level of the GMAT.

Choice (A) is slam-dunk obvious to native ears. All four other choices unnecessarily complicate matters.

This question might be good as easier warm-up, for instance, if non-native speakers needed to practice with slightly easier material before moving up the level of the GMAT. For that, this question would be appropriate. On the other hand, if one hopes questions of this sort will prepare one for the level of the GMAT itself, one would be woefully misled.

Here's a much higher quality SC practice question, much closer to the level of the GMAT:
Few stories have captured

Does all this make sense?
Mike