What is the balanced redox reaction equation between oxalic acid and KMnO₄ in acidic medium?
A. C₂H₂O₄ + 2MnO₄⁻ + 6H⁺ → 2CO₂ + 2Mn²⁺ + 8H₂O
B. C₂H₂O₄ + 2Mn²⁺ + 5H₂O₂ → 2CO₂ + 2MnO₄⁻ + 10H⁺
C. C₂H₂O₄ + 2KMnO₄ + 3H₂SO₄ → 2CO₂ + 2MnSO₄ + 2K₂SO₄ + 8H₂O