What event led to the development of the two different European civilizations of the Western Roman Empire and the Eastern Roman Empire?
A.
Around 350 C.E., Germanic tribes took over much of the empire's western territories.
B.
In the sixth century, trade flourished in the eastern regions but not in the west.
C.
Leaders of the Catholic Church had a major disagreement in the seventh century.
D.
In 395 C.E., the sons of Theodosius I each became emperor of part of the empire.