A sample contains MgNH₄PO₄, Sb₂S₃, KBr, Cr(OH)₃, and PbCl₂. Identify the precipitate after the addition of 6 M HCl; then H₂S and 0.2 M HCl; and then OH- to a pH of 8.

A) MgNH₄PO₄
B) Sb₂S₃
C) KBr
D) Cr(OH)₃
E) PbCl₂