GKFix MCQ Question

What is the equilibrium constant for the reaction 2NO(g) + O2(g) ⇌ 2NO2(g)?

• A. [NO]^2[O2] / [NO2]^2
• B. [NO2] / ([NO]^2[O2])
• C. [NO2]^2 / ([NO]^2[O2])
• D. [NO]^2 / ([NO2]^2[O2])