was the kingfish(huey long) a "great man" who made history, or was he a man who came to power because of historical events?

Which event transfer power from the west to the east? a. the development of a unique code of law for the byzantine empire b. the shift of the roman empire’s capital from rome to constantinople c. the entry of christian priests and missionaries into constantinople d. constantine i’s commemoration as the first byzantine emperor reset next