GKFix MCQ Question

Which of the following is a reduction process?

• A. Mg + F₂ → MgF₂
• B. CH₄ + 2O₂ → CO₂ + 2H₂O
• C. CH₂=CH₂ + H₂ → C₂H₆
• D. 2K₄[Fe(CN)₆] + H₂O₂ → 2K₃[Fe(CN)₆] + 2KOH