Which of the following best describes a conductor?

A conductor is best described as a substance that easily allows electric current to flow. This is because conductors, such as metals like copper and aluminum, have a high density of free electrons that can move easily within the material, facilitating the transfer of electrical energy. When a voltage is applied across a conductor, these free electrons can move toward the positive terminal, resulting in an electric current. This characteristic is fundamental in electrical systems, as conductors are used to create wires and other components that transport electricity from one place to another.

The options that refer to inhibiting electron flow, having no free electrons, or being a mixture of metals do not accurately define a conductor. Inhibiting electron flow describes insulating materials, which do not allow current to pass easily. A compound with no free electrons would not conduct electricity at all, and while a mixture of metals could potentially be a conductor, it does not encompass the primary definition of a conductor that allows for the easy movement of electric current.