The correct answer is D. dolomite.
Dolomite is a sedimentary carbonate rock that contains both magnesium and calcium carbonate. It is a common rock type, and is found in many parts of the world. Dolomite is used in a variety of applications, including construction, agriculture, and the manufacture of glass.
Magnesite is a mineral that is composed of magnesium carbonate. It is a white or grayish-white mineral that is found in many parts of the world. Magnesite is used in a variety of applications, including the manufacture of magnesium metal, magnesium oxide, and dolomite.
Calcite is a mineral that is composed of calcium carbonate. It is a white or colorless mineral that is found in many parts of the world. Calcite is used in a variety of applications, including the manufacture of cement, lime, and glass.
Carnallite is a mineral that is composed of potassium chloride, magnesium chloride, and water. It is a white or colorless mineral that is found in many parts of the world. Carnallite is used in a variety of applications, including the manufacture of potassium fertilizer, magnesium metal, and chlorine.