The correct answer is A) he promoted religious tolerance.
Constantine I helped make Christianity a unifying force in the Byzantine Empire in that he promoted religious tolerance.
The Eastern Roman Empire or Byzantine Empire were Christians that spoke Greek, not Latin, as the Western Roman Empire. In 330 CE, Constantine I, the Great Emperor, moved the capital of the Roman Empire from Rome to Byzantium, later known as Constantinople. Constantine I helped make Christianity a unifying force in the Byzantine Empire in that he promoted religious tolerance. Through Christianity and the respect of other religious beliefs, Constantine strengthened the Empire, grew and prospered.
