The correct answer is B) is able to pass current with little opposition. Copper is an excellent electrical conductor because it has a low electrical resistance, allowing it to pass current with little opposition. This low resistance is due to copper's high electrical conductivity, which is a measure of how easily electrons can flow through the material. The high conductivity of copper is a result of its atomic structure, which allows electrons to move freely through the material. The other answer choices are incorrect. A) holds insulation together well is not a key property of copper that makes it a good electrical conductor. C) has high resistance at low temperatures is the opposite of copper's actual behavior, as its resistance decreases at lower temperatures. D) has a highly polished surface is not a relevant factor for copper's use as an electrical conductor.