Which parameters are plotted in the Ellingham diagram?

• Correct answer
  A

  $\Delta_r \mathrm{G}^{\circ}$ vs T
• B

  $\Delta_r \mathrm{H}^{\circ}$ vs T
• C

  $\Delta_r \mathrm{~S}^{\circ}$ vs P
• D

  $\Delta_r \mathrm{~S}^{\circ}$ vs T

Hence, the correct answer is option: 'A'.