Why Did the Byzantine Empire, an Empire Based in the East

Multiple Choice

Why did the Byzantine Empire, an empire based in the east, see itself as the continuation of the old Roman Empire?

A) It retained most of the territories held by the Roman Empire well into the ninth century.
B) It still relied on Latin as its primary language.
C) It maintained Roman laws and systems of taxation.
D) The two empires shared the same capital, Rome.