GKFix MCQ Question

What is the equilibrium constant for the reaction aA + bB ⇌ cC + dD?

• A. Kc = [A]^a[B]^b / [C]^c[D]^d
• B. Kc = [C]^c[D]^d / ([A]^a[B]^b)
• C. Kc = [C][D] / ([A][B])
• D. Kc = [A][B] / ([C][D])