1. The golden crab of the Gulf of Mexico has not been fished commercially in great numbers, primarily on account of living at great depths—2,500 to 3,000 feet down.
D, like A, fails to provide a noun or pronoun to perform the action of living, but even with itsthe phrases would be more awkward and less clear thanit lives.
so, "on account of its living " still not better than it lives.