Which is a property of copper?

• A. Conducts electricity
• B. Molds at room temperature
• C. Explodes in air
• D. Is transparent

Answer: (A)

Copper is a metal with a sea of free electrons that can move easily when an electric field is applied. This makes it an excellent conductor of electricity, which is why copper is everywhere in electrical wiring and circuits. The other statements don’t describe copper’s typical properties: it is not transparent, it does not explode in air under normal conditions, and while metals can be shaped (malleable) at room temperature, “molds at room temperature” isn’t the defining takeaway for copper. The standout feature that matches copper’s well-known behavior is its ability to conduct electricity.