GKFix MCQ Question

What is the correct expression for Kc for the reaction PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)?

• A. [PCl₅] / ([PCl₃][Cl₂])
• B. [PCl₃] + [Cl₂] / [PCl₅]
• C. [PCl₃][Cl₂] / [PCl₅]
• D. [PCl₅][PCl₃][Cl₂]