What is the equilibrium constant expression, ${K_{\text{c}}}$, for the following reaction?

$${\text{2}}{{\text{H}}_2}{\text{S(g)}} \rightleftharpoons {\text{2}}{{\text{H}}_2}{\text{(g)}} + {{\text{S}}_2}{\text{(g)}}$$

A.     ${K_{\text{c}}} = \frac{{{{{\text{[}}{{\text{H}}_2}{\text{S]}}}^2}}}{{{{{\text{[}}{{\text{H}}_2}{\text{]}}}^2}{\text{[}}{{\text{S}}_2}{\text{]}}}}$

B.     ${K_{\text{c}}} = \frac{{{\text{[}}{{\text{H}}_2}][{{\text{S}}_2}{\text{]}}}}{{{\text{[}}{{\text{H}}_2}{\text{S]}}}}$

C.     ${K_{\text{c}}} = \frac{{{\text{2[}}{{\text{H}}_2}{\text{]}} + {\text{[}}{{\text{S}}_2}{\text{]}}}}{{{\text{2[}}{{\text{H}}_2}{\text{S]}}}}$

D.     ${K_{\text{c}}} = \frac{{{{{\text{[}}{{\text{H}}_2}{\text{]}}}^2}{\text{[}}{{\text{S}}_2}{\text{]}}}}{{{{{\text{[}}{{\text{H}}_2}{\text{S]}}}^2}}}$

D