Among the following, find 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