【请教一道GMAT逻辑题,这题为什么选C啊?麻烦谁给我解释下每个选项哦!Advertisement:Forsinuspain,threeoutoffourhospitalsgivetheirpatientsNovex.Sowhenyouwantthemosteffectivepainkillerforsinuspain,Novexistheone】

　　请教一道GMAT逻辑题,这题为什么选C啊?麻烦谁给我解释下每个选项哦!

　　Advertisement:Forsinuspain,threeoutoffourhospitalsgivetheirpatientsNovex.Sowhenyouwantthemosteffectivepainkillerforsinuspain,Novexistheonetochoose.

　　Whichofthefollowing,iftrue,mostseriouslyunderminestheadvertisement'sargument?

　　A.Somecompetingbrandsofpainkillersareintendedtoreduceotherkindsofpaininadditiontosinuspain.

　　B.ManyhospitalsthatdonotusuallyuseNovexwilldosoforthosepatientswhocannottoleratethedrugthehospitalsusuallyuse.

　　C.Manydrugmanufacturersincreasesalesoftheirproductstohospitalsbysellingtheseproductstothehospitalsatthelowestpricethemanufacturerscanafford.

　　D.Unlikesomecompetingbrandsofpainkillers,Novexisavailablefrompharmacieswithoutadoctor'sprescription.

　　E.InclinicaltrialsNovexhasbeenfoundtobemoreeffectivethancompetingbrandsofpainkillersthathavebeenonthemarketlongerthanNovex.