According to the online article about the Great Wall of China, one reason the wall was built was to protect merchants who were traveling along the . A.
Zhou Road
B.
Silk Road
C.
Vietnam Road
D.
Xia Road

the answer is b.silk road

Explanation:

got it right on the quiz

credit card number 4 is the right answer

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.