In which of the following reactions `H_(2)O_(2)` acts as reducing agent?
(A) `H_(2)O_(2)+2H^(+)+2e^(-) to 2H_(2)O`
(B) `H_(2)O_(2)-2e^(-) to O_(2)+2H^(+)`
(C ). `H_(2)O_(2)+2e^(-) to 2OH^(-)`
(D) `H_(2)O_(2)+2OH^(-)-2e^(-) to O_(2)+2H_(2)O`