A student is building an electrical circuit. Which material should she choose for the wires, and why?
A. A noble gas such as krypton, because its atoms are far apart and it is nearly inert
B. A nonmetal such as carbon, because its atoms have tightly bound electrons
C. A metalloid such as germanium, because only some of its atoms have mobile electrons
D. A metal such as copper, because its atoms have very mobile electrons
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