Formation of photochemical smog involves the following reaction in which A, B and C are respectively.
(i) $\mathrm{NO}_2 \xrightarrow{\mathrm{hv}} \mathrm{A}+\mathrm{B}$
(ii) $\mathrm{B}+\mathrm{O}_2 \rightarrow \mathrm{C}$
(iii) $\mathrm{A}+\mathrm{C} \rightarrow \mathrm{NO}_2+\mathrm{O}_2$
Choose the correct answer from the options given below: