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Which of the following is the laboratory preparation of dihydrogen?
(a) \( \mathrm{Zn}+2 \mathrm{NaOH} \longrightarrow \mathrm{Na}_{2} \mathrm{ZnO}_{2}+\mathrm{H}_{2} \)
(b) \( 2 \mathrm{Na}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{NaOH}+\mathrm{H}_{2} \)
(c) \( \mathrm{CaH}_{2}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}+2 \mathrm{H}_{2} \)
(d) All of the above
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