GKFix MCQ Question

Which of the following reactions demonstrates the formation of water from the elements?

• A. 2H₂ + O₂ → 2H₂O
• B. C + O₂ → CO₂
• C. 2Mg + O₂ → 2MgO
• D. 4Al + 3O₂ → 2Al₂O₃