Answer:
D. Water District
Explanation:
A postal service and social security are created by the U.S.
A sheriff's department is created by a county.
So the only option left is a water district
<span>US and Great Britain </span>
A.The empire was regularly attacked by Arab Muslims.
The Byzantine Empire was a prized region to obtain for the Arab Muslims.
The Arab Muslim Empire regularly attacked the Byzantine Empire. The goal was to gain access to the Anatolia peninsula which was home to Constantinople. Constantinople was the trading center to Europe and and to Asia. Many emperors made the Byzantine Empire a goal and it fell in 1453 under the leadership of Mehmed II.
