Which equation shows the correct form of the Berthelot equation?

• A
  $\left( P + \frac{a}{T(V + C)^2} \right)(V - b) = RT$
• B
  $\left( P + \frac{a}{T(V - C)^2} \right)(V - b) = RT$
• C
  $\left( P + \frac{a}{TV^2} \right)(V - b) = RT$
• D
  $\left( P + \frac{a}{TV^2} \right)(V + b) = RT$