Which Reaction Below Is NOT Important in the Production of Photochemical

Which reaction below is NOT important in the production of photochemical smog?

A) H₂O₂(g) + O₂(g) $\rightarrow$ O₃(g) + H₂Og)
B) N₂(g) + O₂(g) $\rightarrow$ 2 NO(g)
C) O₃(g) + NO(g) $\rightarrow$ O₂(g) + NO₂(g)
D) NO₂(g) $\rightarrow$ NO(g) + O(g)
E) N₂(g) + 3 O₂(g) + OH(g) + CH₃CHO(g) $\rightarrow$ (CH₃O) O₂NO₂ (g) + H₂O(g) + NO₂(g)