GKFix MCQ Question

What is the equilibrium constant expression for the reaction H2(g) + I2(g) ⇌ 2HI(g)?

• A. [H2][I2] / [HI]^2
• B. [HI] / ([H2][I2])
• C. [HI]^2 / ([H2][I2])
• D. [H2]^2[I2]^2 / [HI]^2