In the extraction of copper the smelt formed in the blast furnace contains
a. \( C u_{2} S+ \) little \( \mathrm{FeS} \)
b. \( C u_{2} S+ \) little \( \mathrm{FeO} \)
c. \( \mathrm{Cu}_{2} \mathrm{O}+ \) little \( \mathrm{FeS} \)
d. \( \mathrm{Cu}_{2} \mathrm{O}+ \) little \( \mathrm{FeO} \)
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