H2O2 act as oxidising agent and reducing agent in acidic medium as well as basic medium.
H2O2 act as oxidant:
H2O2+2H++2e−→2H2O (In acidic medium)
H2O2+2e−→2OH−(In basic medium)
H2O2 acts as reductant:-
H2O2→2H++O2+2e−(In acidic medium)
H2O2+2OH−→2H2O+O2+2e−(In basic medium)
Hence, option (d) is correct.