Three of the following are reasons why the Emperor Constantine selected the ancient town of Byzantium as the site for his new capital of Constantinople. Which is NOT?

AIt had an excellent harbor.

BIts nearness to Rome would facilitate communications with the Western Empire.

CIt was strategically located to deal with the Persians in the east and barbarians to the north.

DIt was on the natural trade routes connecting Asia with Europe and the Black Sea with the Mediterranean Sea.