GMAT Sentence Correction (SC) | Re: His efforts to learn scuba diving, a major goal Bob had

His efforts to learn scuba diving, a major goal Bob had set for himself for the coming year, has not significantly begun, seeing as how his fear of claustrophobia is triggered anytime he is underwater.

(A) has not successfully begun, seeing as how
(B) have not successfully begun, seeing as how
(C) have not been successful because
(D) has not been successful because
(E) have not yet met with success, on account of