quEstions 14-16 ChoosE thE CorrECt lEttEr, A,B,C、or D、 writE thE CorrECt lEttEr in BoxEs 14-16 on your AnswEr shEEt. thE mEDiCAl lEttEr group BEliEvEs AntioxiDAnt supplEmEntAtion A.is inEFFECtivE in AttACking FrEE rADiCAls. B、AlErts thE immunE systEm to thE prEsEnCE oF FrEE rADiCAls. C.AttACks Both FrEE rADiCAls AnD thE immunE systEm. D.prEvEnts thE immunE systEm From rEsponDing to FrEE rADiCAls.