The right option is; C limestone
Limestone is the nonmetallic mineral that is used as a building material and also in the manufacture of steel.
Limestone is an abundant naturally occurring rock of marine and fresh water sediments that is primarily composed of high levels of the mineral calcite (CaCO3) with small quantity of other minerals such as quartz (silica), pyrite (iron sulphide) etc. Limestone is used for a wide range of industrial and manufacturing uses. It is used as a building material and it is also an important raw material used in manufacturing iron and steel.
