The correct answer is: Bauxite.
Bauxite is an ore that is the main source of aluminium. It is a soft, earthy rock that is usually red, brown, or yellow in color. Bauxite is found in tropical and subtropical regions around the world. India is one of the world’s leading producers of bauxite.
Monazite is a rare-earth mineral that is found in monazite sand. Monazite sand is a black or brown sand that is found in beach sand and river sand. Monazite sand is a source of rare-earth elements, which are used in many high-tech products, such as electronics, batteries, and magnets.
Fluorspar is a mineral that is used to make hydrofluoric acid, which is used in many industrial processes. Fluorspar is also used to make aluminum fluoride, which is used in the production of aluminum.
Magnetite is an iron ore that is used to make iron and steel. Magnetite is a black ore that is found in rocks and minerals. Magnetite is a natural magnet, which means that it can attract iron and other ferromagnetic materials.
I hope this helps!