GKFix MCQ Question

What is the correct expression for Kp for the reaction CO₂(g) + C(s) ⇌ 2CO(g)?

• A. Kp = P_CO² / P_CO₂
• B. Kp = P_CO₂ / P_CO²
• C. Kp = P_CO / P_CO₂
• D. Kp = P_CO₂ / P_CO