A Major Advantage of a Fuel Cell Over a Standard

A major advantage of a fuel cell over a standard battery is that

A) as long as oxygen and fuel are supplied,a fuel cell will not "run down" like a battery will.
B) a fuel cell generates electricity without the need for an oxidation-reduction reaction.
C) a fuel cell is 100% efficient at generating electricity,whereas a battery is less than 1% efficient.
D) as it generates electricity,a fuel cell produces more fuel than it uses.