The correct answer is A. Aluminium.
Bauxite is the main ore of aluminium. It is a mixture of aluminium oxide, iron oxide, and silica. Bauxite is mined and then processed to produce alumina, which is then used to make aluminium metal.
Iron is the main ore of iron. It is found in rocks and minerals such as hematite, magnetite, and taconite. Iron is mined and then processed to produce iron ore concentrate, which is then used to make iron and steel.
Steel is an alloy of iron and carbon. It is made by melting iron and then adding carbon to it. Steel is a
strong and durable material that is used in many different industries.Gold is a precious metal that is found in rocks and minerals. It is mined and then processed to produce gold bars and coins. Gold is used in jewelry, coins, and electronics.