What occurs when an aqueous solution of `Na_(2)SO_(4)` containing several drops of phenolphthalein is electrolyzed between Pt electrodes?
A. The colourless solution turns pink at the anode but remains colurless at the cathode.
B. The colourless solution turns pink at the cathode but remains colourless at the anode.
C. The pink solution becomes colourless at the anode but remains pink at the cathode.
D. none of the above
