The correct answer is A: Byzantine styles of art spread across the Christian East, from Greece and the Balkans to Russia.
Byzantine arts, i.e., paintings, architecture and other visual arts were produced in the Middle Ages by the Byzantine Empire which spread to other states and nations that inherited the culture from the empire.
The Eastern Orthodox states in Eastern Europe, Greeks the Muslim States in the eastern Mediterranean to date have preserved several aspects of the Byzantine Empire's cultural art several centuries afterward.