Which was an achievement of the byzantine empire?

a. conquering persia

b. promoting paganism

c. regaining Palestine from the Muslims

d. preserving Greek and Roman civilization

An achievement of the byzantine empire was d) preserving Greek and Roman civilization. Although the Byzantine Empire preserved both of these ancient civilizations, it also created the divide where Eastern and Western Christianity were more developed. This included the separation between people who believed in venerating icons and people who believed it should be banned. There was also a rejection of paganism.