Answer: The central ideas of christianity are the action of believing in god, the death, entering into hell, the Holy spirit. And resurrection of Christ.
Explanation:
I will say it's C. It extended over three major continents.
The final fall of the Byzantine Empire was caused by attacks from the Ottomans.
The Byzantine Empire fell, and Islam spread into Eastern Europe. The Byzantine Empire fell in 1453. The main reason of its fall was a significant number of attacks made by the Ottoman Turks. In 1454, Constantinople finally surrendered to them.