GKFix MCQ Question

What is the correct expression for the standard enthalpy change of the reaction: A → B + C?

• A. ∆rH⁰ = ∆fH⁰(A)
• B. ∆rH⁰ = ∆fH⁰(B) + ∆fH⁰(C)
• C. ∆rH⁰ = ∆fH⁰(B) + ∆fH⁰(C) – ∆fH⁰(A)
• D. ∆rH⁰ = ∆fH⁰(A) – ∆fH⁰(B) – ∆fH⁰(C)