Acetylene gas (C₂H₂) burns in oxygen, producing gaseous carbon dioxide and steam. What is the balanced chemical equation for this combustion reaction?

a) 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
b) C₂H₂ + 3O₂ → 2CO₂ + H₂O
c) 4C₂H₂ + 10O₂ → 8CO₂ + 4H₂O
d) C₂H₂ + 2O₂ → CO₂ + H₂O