What was the primary basis of aksum's wealth?

It seems that you have missed the given choices of the question above; but anyway, here is the correct answer. The primary basis of Aksum's wealth is that, they controlled extensive trade routes that connected many cultures. 
Here are the given choices:
A They discovered rich gold deposits within the boundaries of the kingdom. 
B They controlled extensive trade routes that connected many cultures. 
C They exported thousands of slaves to Europe. 
D They conquered Egypt and assimilated all of Egypt's wealth.

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