Electrolysis of aqueous $$\text{CuSO}_4$$ (0.1 M) was carried out in two cells I and II. In I, the electrodes are of Cu and in II they were of Pt. As the electrolysis proceeds the pH of the electrolyte solution will

A

decrease in II and remain the same in I

B

remain the same in both I and II

C

increase in both I and II

D

increase in I and decrease in II