The plot shows the variation of $- \ln K_p$ versus temperature for the two reactions:
$M_{(s)} + \frac{1}{2} O_{2(g)} \to MO_{(s)}$ and $C_{(s)} + \frac{1}{2} O_{2(g)} \to CO_{(g)}$
Identify the correct statement.

• A
  At $T < 1200 \ K$,oxidation of carbon is unfavourable.
• B
  Oxidation of carbon is favourable at all temperatures.
• C
  At $T < 1200 \ K$,the reaction $MO_{(s)} + C_{(s)} \to M_{(s)} + CO_{(g)}$ is spontaneous.
• D
  At $T > 1200 \ K$,carbon will reduce $MO_{(s)}$ to $M_{(s)}$.