B. It reunited northern and southern China in the sixth century.
The Sui Dynasty was a relatively short one, it only lasted from 589 AD to 618 AD. Therefore, A. C. and D. are incorrect because the Dynasty was not in power at those times. So, B is correct because it did reunite northern and southern China with its creation in the 6th century.
Trans-Saharan trade routes promoted the growth of powerful trading cities in the time period because they traded valuable items like slaves, gold, and salt, which increased the net worth of the cities and allowed for economic growth that way. Because of the trading, the Trans-Saharan cities could grow
Answer:isolationists
Explanation: isolationists generally believe that interaction politically with other nations should be limited to keep their home nation out of external wars and political disputes. They also tend to be the same people who would prefer if their home nation was self sufficient and did not rely on imports from other countries economically.
I used to get these just type the sentence it gives u it
