GKFix MCQ Question

In the reaction Fe₂O₃ + 3H₂ → 2Fe + 3H₂O, which species have ∆fH⁰ = 0?

• A. Fe₂O₃ and H₂O
• B. Fe and H₂O
• C. Fe(s) and H₂(g)
• D. H₂ and H₂O