Which of the following is incorrect on the basis of the Ellingham diagram for carbon?

• A
  Up to $710^{\circ}C$,the reaction of formation of $CO_2$ is energetically more favorable,but above $710^{\circ}C$,the formation of $CO$ is preferred.
• B
  In principle,carbon can be used to reduce any metal oxide at a sufficiently high temperature.
• C
  $\Delta S(C_{(s)} + 1/2 O_{2(g)} \to CO_{(g)}) < \Delta S(C_{(s)} + O_{2(g)} \to CO_{2(g)})$
• D
  Carbon reduces many oxides at elevated temperature because the $\Delta G^{\circ}$ vs temperature line has a negative slope.