Which of the following is an example of a conductor?

Copper is recognized as an excellent conductor of electricity and heat, making it the correct answer in this context. Conductors are materials that allow the flow of electric current with minimal resistance, and copper is widely used in electrical wiring and electronic components due to its high conductivity. Its atomic structure allows for free movement of electrons, which is essential for conducting electricity efficiently.

In contrast, rubber, plastic, and ceramic are generally classified as insulators. These materials resist the flow of electric current; for instance, rubber is often used to insulate wires to prevent accidental shocks or short circuits. Plastic serves similar functions in various electrical applications by preventing unwanted current flow. Ceramics can exhibit a range of electrical properties, but they are primarily used for their insulating capabilities in many contexts. Therefore, copper stands out as the prime example of a conductor among the given choices.