Answer:
The best description would be that they were regularly attacked by the arabs eventually leading to the fall of the Byzantines and there empire and lead to the citys rename to istanbul which is still there in modern day middle east. It is The empire was regularly attacked by Arab Muslims. I hope this helped.
Explanation:
The answer is D. Think about the opium trade.
I believe the power was separated so that no one group of people had to much power. It is the basic gest of why we separate a lot of things so that everyone has equality and all power is not going to one person or group who does things in favor of another person or group. The power was then distributed so each branch could help keep the other branch from becoming power hungry and unsociable power feigns.