In 330 C.E., what did Emperor Constantine do that led to the beginning of the Byzantine Empire?

A.
He founded Constantinople and moved the Roman Empire's capital there.
B.
He angered the Roman nobility, leading to a civil war between the east and west.
C.
He converted to Christianity and decreed that all other religions were banned.
D.
He divided the Roman Empire into several different kingdoms and empires.

A. He founded Constantinople and moved the Roman Empire's capital there.