Which of the following reaction is reaction is used to make a fuel cell .

Options

A. `Cd_((s))+2Ni(OH)_(3(s)) to CdO_((s))+2Ni(OH)+H_(2)O_((l))`
B. `Pb_((s))+PbO_(2(s))+2H_(2)SO_(4(aq)) to 2PbSO_(4)_((s))+2H_(2)O_((l))`
C. `2H_(2(g))+O_(2(g)) to 2H_(2)O_((l))`
D. `2Fe_((s))+O_(2(g))+4H_((aq))^(+) to 2Fe_((aq))^(+)+2H_(2)O_((l))`

Answer

C