The correct answer is D. Bauxite.
Bauxite is the most important ore of aluminum. It is an aluminum ore that is found in the Earth’s crust. Bauxite is a mixture of minerals, including gibbsite, boehmite, and diaspore. These minerals are aluminum hydroxides. Bauxite is the only ore that is used to produce aluminum metal.
Galena is a lead sulfide ore. It is a mineral that is found in the Earth’s crust. Galena is a black ore that is often found in veins. Galena is used to produce lead metal.
Calamine is a zinc carbonate ore. It is a mineral that is found in the Earth’s crust. Calamine is a white ore that is often found in veins. Calamine is used to produce zinc metal.
Calcite is a calcium carbonate ore. It is a mineral that is found in the Earth’s crust. Calcite is a white ore that is often found in veins. Calcite is used to produce calcium metal.