world history question.. i need to know if my answer is correct.?

urbina 01

New member
The West African kingdoms of Ghana, Mali and Songhai experienced great political and economic prosperity...?


a. were able to resolve tribal conflicts in their empires

b. established sacred religious centers

c. maintained highly structured social systems

d controlled vast reserves of gold and important trade routes...
i think its d.. i may be wrong so please help me out.
 
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