Among the following, find out the correct statements -
- (I) Coal, petroleum and natural gas are called fossil fuels.
- (II) Coal and natural gas are exhaustible substances.
- (III) CNG is more polluting than petrol.
- (IV) Coke is used in the manufacture of steel.
(a) I and II only
(b) II and IV only
(c) I, III and IV only
(d) I, II and IV only