"it is A DistinCt group AnD not A trAnsitory ClAss BEtwEEn thE whitE AnD BluE" mEAns grAyCollAr workErs will BE A ______ group oF proFEssions.
A．

A. DEFinitE AnD sEpArAtE

B．

B. short-tErm AnD ChAngEABlE

C．

C. mErEly tEmporAry