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Sulfur dioxide can be catalytically oxidised by an oxide of nitrogen in the atmosphere.

Which reaction shows how the catalyst is reformed?
A. N₂ + 2O₂ ⇌ 2NO₂
B. 4NH₃ + 5O₂ → 4NO + 6H₂O
C. N₂ + O₂ → 2NO
D. NO + 1/2 O₂ → NO₂