Use the map to answer the question.
The map is entitled Silk Road Trade Network. It shows trade routes connecting civilizations in Europe, Africa, and Asia.
How did this trade network affect the civilizations who were involved in it?
A.
It led the leaders of their governments to establish isolationist policies.
B.
It provided them access to resources not available in their environments.
C.
It contributed to the rapid decline of their economies.
D.
It helped to protect them from the spread of disease.