GKFix MCQ Question

What is the correct half-reaction for the reduction of oxygen in 4Na(s) + O₂(g) → 2Na₂O(s)?

• A. O₂ → 2O⁺ + 4e⁻
• B. O₂ + 4e⁻ → 2O⁺
• C. O₂ → 2O²⁻ + 4e⁻
• D. O₂ + 4e⁻ → 2O²⁻