Explanation

(c)
Among cuprite $\left\lbrack Cu_{2}O \right\rbrack,$ chalcocite $\left\lbrack Cu_{2}S \right\rbrack,$ chalcopyrite $\lbrack CuFeS_{2}\rbrack$ and malachite [$Cu(OH)_{2}.CuCO_{3}\rbrack;$ only chalcopyrite is an ore which contains both Fe and Cu