ANSWER
OPTION C
Step-by-step explanation
Electrolytic cell is an electrochemical cell that depends on external source (electrical energy) to drive a chemical reaction.
In an electrolytic cell, reduction happened at the cathode and oxidation happened at the anode
Voltaic cell is an electrochemical cell that use chemical reaction to produce electrical energy.
In voltaic cell, reduction happened at the cathode and oxidation happened at the anode.
Hence, reduction occurs at the cathode in both electrolytic and voltaic cells