Which statement concerning the electrolysis of aqueous copper(II) sulfate is correct?
- AWhen copper electrodes are used, the solution turns from blue to colourless.
- BWhen graphite electrodes are used, bubbles of gas are formed at the cathode.
- CWhen copper electrodes are used, the anode gets smaller.
- DWhen graphite electrodes are used, the colour of the solution does not change.