Colourless salt (A) gives white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing H2S gas into (A) solution white ppt (D) appears. (A) also gives white ppt (E) with AgNO3 solution.

Which of the following is compound D?

AgS CuS NiS ZnS

ZnS

On passing H2​S gas into (C) white ppt (D) appears. Na2​ZnO2​ +H2​S ⟶ ZnS + 2NaOH