The diagram illustrates a circuit used for the electrolysis of aqueous copper(II) sulfate. Which arrows show the direction of the copper ions in the electrolyte and the electrons in the external circuit?
- Acopper ions: 1; electrons: 3
- Bcopper ions: 1; electrons: 4
- Ccopper ions: 2; electrons: 3
- Dcopper ions: 2; electrons: 4