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?

a. it had an excellent harbor.
b. its nearness to rome would facilitate communications with the western empire.
c. it was strategically located to deal with the persians in the east and barbarians to the north.
d. it was on the natural trade routes connecting asia with europe and the black sea with the mediterranean sea.