Which of the following is insoluble in dil. \( \mathrm{HNO}_{3} \) ...

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Which of the following is insoluble in dil. \( \mathrm{HNO}_{3} \) but dissolves in aqua regia?
\( \mathrm{P} \)
(a) \( \mathrm{HgS} \)
(b) \( \mathrm{PbS} \)
W.
(c) \( \mathrm{Bi}_{2} \mathrm{~S}_{3} \)
(d) \( \mathrm{CuS} \).
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