The correct answer is B) gold and salt.
When it was powerful, the Mali empire controlled the trade of gold and salt.
At the height of its power, the Mali Empire used to control the trade of two important natural elements such as gold and salt. The Mali Empire had routes throughout the Sahara Desert to the coasts of North Africa. Mali Empire used camels and caravans to transport the products. Other nations were marveled by the gold but also were in need of salt for the preservation of their food.
The other options of the question were a) gold and diamonds, c) run¿bber and chocolate, and d) millet and sorghum.