Each element is made up of only one kind of atom.
Each element has their own atom.
Copper, because it has the lowest specific electrical resistance.
specific electrical resistance aka volume resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current.
Either A or D. If I were answering I'd go with my git answer and say A
Flowing electrons produce a magnetic field, and spinning magnets cause an electric current to flow. Hope this helps you out.