whiCh oF thE Following DoEs not hElp to sEpArAtE thE usEFul u-235 AnD nEArly usElEss u~2387 A.thE prinCiplE oF gAsEous DiFFusion. B.A proCEss involving mAgnEtiC sEpArAtion oF thE two isotopEs. C.A proCEss nEArly iDEntiCAl in thE ChEmiCAl mAkEup. D.A gAs CEntriFug