During smelting process, the combination of fuel in the furnace
(A) Forms carbon dioxide
(B) Carbon dioxide with carbon forms carbon mono-oxide
(C) Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
(D) All the above
(A) Forms carbon dioxide
(B) Carbon dioxide with carbon forms carbon mono-oxide
(C) Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
(D) All the above