The correct answer is A. Iron.
Iron is a naturally occurring mineral that is found in pure form. It is the most abundant metal in the Earth’s crust and is used in a variety of applications, including construction, manufacturing, and transportation.
Copper is a naturally occurring mineral that is not found in pure form. It is usually found in combination with other minerals, such as sulfur or oxygen. Copper is used in a variety of applications, including electrical wiring, plumbing, and jewelry.
Bauxite is a mineral that is the
main source of aluminum. It is not found in pure form and is usually mixed with other minerals, such as clay or silica. Bauxite is used in the production of aluminum metal.Manganese is a naturally occurring mineral that is not found in pure form. It is usually found in combination with other minerals, such as iron ore. Manganese is used in a variety of applications, including steel production, batteries, and fertilizers.