_____ has the highest conductivity of the commercial metals and has excellent resistance to oxidation and corrosion.

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Electrical conductivity is about how freely electrons can move through a metal. Among common commercial metals, copper has the highest conductivity, which is why it’s the standard material for wiring and electrical components. It also resists oxidation and corrosion well in many environments, forming a protective surface layer that helps it last. Aluminum conducts electricity well, but not as well as copper, and its corrosion behavior is different due to its oxide film—still not enough to beat copper’s combination of high conductivity and good corrosion resistance. Steel conducts less because it’s iron-based and often alloyed, and it corrodes more readily unless protected. Brass is slower to conduct than pure copper since it’s an alloy of copper and zinc, which reduces electron flow. So, copper best fits the idea of having the highest conductivity among these options while also offering excellent resistance to oxidation and corrosion.