At the temperature corresponding to which of the points in figure, Feo will be reduced to Fe by coupling the reaction, $2\mathrm{FeO}⟶2\mathrm{Fe}+{\mathrm{O}}_2$ with all of the following reactions?
 

1.$\mathrm{C}+{\mathrm{O}}_2⟶{\mathrm{CO}}_2$
2.$2\mathrm{C}+{\mathrm{O}}_2⟶2\mathrm{CO}$
3. $2\mathrm{CO}+{\mathrm{O}}_2⟶2{\mathrm{CO}}_2$

Below point B and E, FeO will be reduced to Fe by all the three reactions shown above in the question. ${\mathrm{\Delta G}}_{\left(\mathrm{C},{\mathrm{CO}}_2\right)}^{\circ },{\mathrm{\Delta G}}_{(\mathrm{C},\mathrm{CO})}^{\circ },{\mathrm{\Delta G}}_{\left(\mathrm{CO},{\mathrm{CO}}_2\right)}^{\circ }$ lie below ${\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{G}}^{\circ }(\mathrm{Fe},\mathrm{FeO})$ curve at point B and E. Therefore, FeO will be reduced by all three reactions. Hence, options (b) and (d) are correct choice.