# Argenite is a ore of

$(a)\;Ag \\(b)\;Au \\(c)\; Pt \\(d)\;Cu$

Argenite is an ore of $Ag$
Argentite is cubic silver sulfide $(Ag_2S)$, which can only exist at temperatures above 173 °C,177 °Cor 179 °C. it forms an important ore of silver.
Hence a is the correct answer.
edited Nov 24, 2017