NEET 2005 Chemistry question

gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because :

• (A)presence of HCl decreases the sulphide ion concentrationCorrect
• (B)presence of HCl increases the sulphide ion concentration
• (C)solubility product of group II sulphides is more than that of group IV sulphides
• (D)sulphides of group IV cations are unstable in HCl