Select the incorrect statements.
I. Coal is a mixture of chemical substances containing
carbon, hydrogen, oxygen and small amount of nitrogen and sulphur.
II. Inexhaustible natural resources cannot be replenished continually.
III. When coal is heated in the absence of air, carbon monoxide is produced which is a poisonous gas.
IV. Coal is used as a source of energy in various industries like cement, paper, steel etc.
AI and III only
BII and III only
CII and IV only
DI, II, III and IV