Which of These Chemical Equations Describes a Disproportionation Reaction

Multiple Choice

Which of these chemical equations describes a disproportionation reaction?

A) 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(l)
B) 2KBr(aq) + Cl₂(g) → 2KCl(aq) + Br₂(l)
C) 2H₂O₂(aq) → 2H₂O(l) + O₂(g)
D) CaBr₂(aq) + H₂SO₄(aq) → CaSO₄(s) + 2HBr(g)
E) 2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄) ₃(aq) + 3H₂(g)