Which Chemical Equation Describes a Combustion Reaction

Multiple Choice

Which chemical equation describes a combustion reaction?

A) 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(l)
B) LiOH(aq) + HNO₃(aq) → LiNO₃(aq) + H₂O(l)
C) N₂(g) + 3H₂(g) → 2NH₃(g)
D) 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)
E) 2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄) ₃(aq) + 3H₂(g)