Which of the following combination will produce ${\mathrm{H}}_2$ gas

$\begin{array}{l}\text{ (A) }\mathrm{Zn}+2\mathrm{NaOH}\to {\mathrm{Na}}_2{\mathrm{ZnO}}_2+{\mathrm{H}}_2\\ \text{ (B) }\mathrm{Cu}+4{\mathrm{HNO}}_3\left(\text{ con }\right)\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2+2{\mathrm{NO}}_2+2{\mathrm{H}}_2\mathrm{O}\\ \text{ (C) }4\mathrm{Au}+8\mathrm{NaCN}+{\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}\to 4\mathrm{Na}\left[\mathrm{Au}(\mathrm{CN}{)}_2\right]+4\mathrm{NaOH}\end{array}$
(D) Formation of passive layer of Fe₂O₃ on the surface of Fe and NO₂ gas is evolved.