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(B) The correct answer is $B$. Pure $Cu$ is already an excellent conductor because it has a partially filled conduction band.Furthermore,$Cu$ forms a

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No

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(B) The correct answer is $B$. Pure $Cu$ is already an excellent conductor because it has a partially filled conduction band.Furthermore,$Cu$ forms a metallic crystal lattice,unlike the covalent crystal structures of semiconductors like silicon or germanium.Therefore,the doping scheme used to donate or accept electrons in semiconductors does not work for copper.In fact,adding impurities to copper decreases its electrical conductivity because impurity atoms act as scattering centers for electrons,which impedes the flow of current.

Would there be any advantage to adding $n$-type or $p$-type impurities to copper?

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