the one which is oxidized is reducing agent Pb was 0 and turned to +2 in PbSo4 because SO4 is -2 so Pb is oxidized and it is reducing agent Answer A is correct Solution the one which is oxidized is reducing agent Pb was 0 and turned to +2 in PbSo4 because SO4 is -2 so Pb is oxidized and it is reducing agent Answer A is correct.