Oblivious to the existence of the Pacific Ocean, Columbus, the great explorer of "New World", was certain that his journey had been along the east coast of Asia.

A. was certain that his journey had been along the east coast of Asia
B. had certainty that his journey had been along the east coast of Asia
C. was in certainty as to his journey being along the east coast of Asia
D. was certain about having journeyed along the east coast of Asia
E. was certain of journeying along the east coast of Asia