Which of the following is the correct quadratic form of Ostwald's dilution law equation for an $AB$ type electrolyte?

• A
  $\alpha^2 C + \alpha K - K = 0$
• B
  $\alpha^2 C - \alpha K - K = 0$
• C
  $\alpha^2 C - \alpha K + K = 0$
• D
  $\alpha^2 C + \alpha K + K = 0$