GKFix MCQ Question

What is the expression for Kc for the reaction: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g)?

• A. [SO₂]² [O₂] / [SO₃]²
• B. [SO₃] / ([SO₂][O₂])
• C. [SO₃]² / ([SO₂]² [O₂])
• D. 2[SO₃] / (2[SO₂] + [O₂])