$H_2S$ in the presence of HCl precipitates group II but not group IV because

Question

(a) HCl activates $H_2S$
(b) HCl increases the concentration of $Cl^-$ ions
(c) HCl decreases the concentration of $S^{2-}$ ions
(d) HCl lowers the solubility of $H_2S$ in the solution