Determine which of the following equations is balanced.

• A. MgC₂ + 2H₂O → Mg(OH)₂ + C₂H₂
• B. 3CaO + 2Fe → Fe₂O₃ + Ca
• C. 2CO₂ → 2C + O₂
• D. CH₄ + O₂ → CO₂ + H₂O

Answer: (A)