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# $NO+O_3\rightarrow NO_2+O_2,\;O_3+hv\rightarrow x+y,\;NO_2+O\rightarrow z+x$. Net reaction : $A(O_3)+hv\rightarrow BO_2$. The $z+x$ are

$\begin{array}{1 1}(a)\;NO+O_2\\(b)\;NO_2+CO_2\\(c)\;NO_2+O_3\\(d)\;NO_3+O_2\end{array}$

$NO+O_3\rightarrow NO_2+O_2$
$O_3+hv\rightarrow O_2 + [O]$
$NO_2+O\rightarrow NO+O_2$
Hence $z+x$ is $NO+O_2$
Hence (a) is the correct answer.
edited Mar 25, 2014