The correct answer is A. Salt and Gold. The Empire of Ghana became wealthy through its control of the trade routes in West Africa, specifically in salt and gold. To arrive at this answer, you can first eliminate options C (Fish and Cotton) and D (Bronze and Ivory) since they are not historically associated with the wealth of the Empire of Ghana. Then, you can compare options A (Salt and Gold) and B (Silver and Diamonds). By analyzing historical records and scholarly sources, you would find that salt and gold were the primary resources that contributed to Ghana's wealth, making option A the correct choice.
