Final answer:
A conductor is the material that best transports electricity due to its low resistivity and high free charge density, allowing for the easy movement of electric charges. Therefore the correct answer is 2) Conductor.
Step-by-step explanation:
The material that best transports electricity is a conductor. Conductors, such as copper, silver, and aluminum, have the smallest resistivities and high free charge densities, which allow electric charges to move easily through them.
Unlike conductors, insulators have a large resistivity with most charges bound to atoms, making it difficult for charges to move freely.
Finally, semiconductors have intermediate resistivities, and under certain conditions, they can conduct electricity due to their dependence on impurities; silicon is a notable semiconductor extensively used in modern electronics.
Conductors allow electric charges to move easily through them. Some examples of conductors include most metals like copper, silver, and aluminum. These materials have a large number of free electrons that can easily move, allowing the flow of electricity.