Q: You are presented with the quiz "What can be used in wiring as a conductor?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "wiring requires an electrical conductor" and "metals, such as copper wire, are good conductors for carrying electric current". So, what's the best answer to the question?

Options are: 1. paper; 2. energy; 3. tube; 4. copper; 5. a prism; 6. photons; 7. leather; 8. light;
The answer is:
4.