What is the equilibrium constant expression, \({K_{\text{c}}}\), for this reaction?

\[{\text{2NO(g)}} + {{\text{H}}_{\text{2}}}{\text{(g)}} \rightleftharpoons {{\text{N}}_{\text{2}}}{\text{O(g)}} + {{\text{H}}_{\text{2}}}{\text{O(g)}}\]

A.     \({K_{\text{c}}} = \frac{{{\text{[}}{{\text{N}}_2}{\text{O]}} + {\text{[}}{{\text{H}}_2}{\text{O]}}}}{{{\text{2[NO]}} + {\text{[}}{{\text{H}}_2}{\text{]}}}}\)

B.     \({K_{\text{c}}} = \frac{{{{{\text{[NO]}}}^2}{\text{[}}{{\text{H}}_2}{\text{]}}}}{{{\text{[}}{{\text{N}}_2}{\text{O][}}{{\text{H}}_2}{\text{O]}}}}\)

C.     \({K_{\text{c}}} = \frac{{{\text{[2NO]}} + {\text{[}}{{\text{H}}_2}{\text{]}}}}{{{\text{[}}{{\text{N}}_2}{\text{O]}} + {\text{[}}{{\text{H}}_2}{\text{O]}}}}\)

D.     \({K_{\text{c}}} = \frac{{{\text{[}}{{\text{N}}_2}{\text{O][}}{{\text{H}}_2}{\text{O]}}}}{{{{{\text{[NO]}}}^2}{\text{[}}{{\text{H}}_2}{\text{]}}}}\)

D