Answer:
C. Zimbabwe controlled trade routes that flowed to the East African coast
This was considered to be the source of Great Zimbabwe’s wealth
Step-by-step explanation:
Archaelogical excavations suggests that Great Zimbabwe was once a center of trading with the network linked to historic center of kilwa ( present day Tanzania in eastern Africa) and extends to china.
The trade was mainly focused on gold and ivories. Some data estimates show that around 20 million ounces of gold were extracted from the country. In addition to international trade, they practiced local agricultural trade which makes Zimbabwe to control the trade routes that flowed to the East African coast.