In binary-acid nomenclature, what is hydrosulfuric acid?

• A. $H_2{S}_{O_4}$ (aq), sulfuric acid
• B. $HS$ (aq), hydrosulfuric acid
• C. $H_{2}S$ (aq), aqueous hydrogen sulfide
• D. $HSO{3}_{\mathrm{}}$ (aq), sulfurous acid

Answer: (C)