Which two of the following are examples of conducting materials?

The correct choice highlights copper and aluminum as examples of conducting materials due to their ability to allow the flow of electric current. Conductors are materials that have free electrons, which enable electricity to pass through them with minimal resistance.

Copper is widely used in electrical wiring because it is highly conductive, durable, and has a good strength-to-weight ratio. Aluminum, while less conductive than copper, is still a very effective conductor and is often used in overhead power lines due to its lightweight and lower cost.

In contrast, the other options include materials that do not conduct electricity effectively. Wood and rubber, for example, are generally considered insulators, preventing the flow of electric current. Glass and plastic are also insulators, commonly used to coat or support electrical systems and prevent inadvertent current flow. Although water can conduct electricity when impurities are present, pure water is not an effective conductor, and oil is an insulator. Thus, copper and aluminum stand out as prime examples of conductive materials in the context of electricity.