How were the ancient African kingdoms of Ghana and Mali similar?

Question

a. Both established successful naval forces that helped acquire new territory
b. Both helped facilitate the transatlantic slave trade
c. Both became rich through trade in gold and salt
d. Both embraced Catholicism and helped the religion spread to ther regions

Answer 1

The correct answer is:

c. Both became rich through trade in gold and salt.

The ancient kingdoms of Ghana and Mali were known for their wealth, which was largely derived from their control over the trade routes for gold and salt across West Africa.