A sample contains Ba3(PO4)2, CdS, AgCl, NH4Cl, and ZnS. Identify the soluble salt remaining in the solution after the addition of 6 mol L-1 HCl, followed by the addition of H2S and 0.2 mol L-1 HCl, then the addition of OH- to a pH of 8, and finally the addition of (NH4)2HPO4 with NH3 A) CdS
B) Ba3(PO4)2
C) NH4Cl
D) ZnS
E) AgCl