How is \( \mathrm{H}_{2} \mathrm{~S} \) prepared in laboratory ? (A...

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How is \( \mathrm{H}_{2} \mathrm{~S} \) prepared in laboratory ?
(A) \( \mathrm{FeS}+\mathrm{H}_{2} \mathrm{SO}_{4} \)
\( \mathrm{P} \)
(B) \( \mathrm{FeSO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4} \)
WV
(C) \( \mathrm{FeS}+\mathrm{HCl} \)
(D) Elemental \( \mathrm{H}_{2}+ \) elemental \( \mathrm{S}_{8} \)
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