Answer:
Between the 1200 and 1450, the Sub-Saharan African region was thriving with trade.
Powerful Kingdoms such as Aksum existed in modern day Ethiopia and Sudan while other kingdoms Da'amat further south-west.
While the period was generally known for powerful Empires in Asia and the Middle East, the Sub Saharan countries were able to develop thriving trading business that included salt, agriculture products, salves etc.
Their biggest achievement was of maintaining sophisticated trading links between one another and minimal conflict.
They had a lot of sacrifices
The answer to this question will be
C.
outsourcing labor
