Except Option B remaining all reactions will takes place in blast furnace during extraction of iron.

${\mathrm{Fe}}_2{\mathrm{O}}_3+\mathrm{CO}\stackrel{}{\to }2\mathrm{FeO}+{\mathrm{CO}}_2$

This reaction takes place at $500 - 800 \mathrm{K}$. 

At this temperature, the iron ore is in a solid state and the carbon monoxide is a gas. The coke burns in the lower part of the furnace to produce carbon monoxide, which rises through the furnace and reacts with the iron ore in the upper part of the furnace.