The correct answer is C. Both (A) and (B).
Pyrite is a mineral that is composed of iron sulfide. It is the most common form of sulfide mineral and is found in many parts of the world. Pyrite is a valuable mineral because it can be used to produce sulfuric acid and iron oxide.
Sulfuric acid is a strong acid that is used in many industrial processes. It is also used to produce fertilizers, detergents, and other chemicals. Iron oxide is a mineral that is used to make iron and steel. It is also used in paints, pigments, and other products.
Pyrite is a valuable mineral that has many uses. It is used to produce sulfuric acid and iron oxide. These two products are used in many industrial processes and products.