In which of the following reactions, `H_(2)O_(2)` act as a reducing agent ?
A. `PbS_((s))+4H_(4)O_(2(aq))overset(H^(+))rarrPbSO_(4(s))+H_(2)O(l)`
B. `HOCl+H_(2)O_(2)overset(H^(+))rarrH_(3)O^(+)+Cl^(-1)+O_(2)`
C. `Mn^(2+)+H_(2)O_(2)overset(OH^(-))rarrMn^(4+)+2OH^(-)`
D. `Fe^(2+)+H_(2)O_(2)overset(OH^(-))rarr2Fe^(3+)+2OH^(-)`
