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