Why was salt an important commodity of west African trade

Once cultures began relying on grain, vegetable, or boiled meat diets instead of mainly hunting and eating roasted meat, adding salt to food became an absolute necessity for maintaining life. Because the Akan lived in the forests of West Africa, they had few natural resources for salt and always needed to trade for it

Explanation:

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i would think it's industries and hydroelectric power

answer; ///i do believe that the correct answer is (b) ///middle colony