The correct answer is D. Iron ore, carbon and lime stone.
Iron ore is the primary raw material used in steelmaking. It is a mineral that contains iron and other elements. The iron is extracted from the ore by a process called smelting.
Coal is used as a fuel in the steelmaking process. It provides the heat that is needed to melt the iron ore and to remove the impurities from the iron.
Limestone is used to remove impurities from the iron ore and to make the iron melt more easily. It is also used to make the steel stronger.
The other options are incorrect because they do not include all three of the basic raw materials that are needed for steelmaking. Option A does not include limestone, option B does not include coal, and option C does not include iron ore.