Concept:Materials that allow electric current to pass through easily are called conductors.Explanation:Aluminium is a metal.Metals have free electrons that move easily, so they conduct electricity well.Carbon can conduct electricity, but metals like aluminium are better conductors.Glass is an insulator, so it does not allow current to pass through easily.Water is a poor conductor unless it contains dissolved substances.Therefore, aluminium allows electric current to pass through most easily.Answer:A. Aluminium