A voltaic cell differs from an electrolytic cell in that in a voltaic cell

Aenergy is produced when the reaction occurs
Benergy is required for the reaction to occur
Cboth oxidation and reduction occur
Dneither oxidation nor reduction occurs

Verified Answer :

The answer is A. Voltaic cells couple oxidation and reduction half reactions to produce electromotive force from chemical potential energy. Electrolytic cells do the opposite in that they require electromotive force to store chemical energy.