A、BECAusE thE u.s. is A lArgE Country.
B、BECAusEAmEriCAns likE to movE ArounD AnD BE inDEpEnDEnt.
C．BECAusE thE u. s. is CAllED thE nAtion on whEEls.
D．BECAusE thE u.s. lACks oF ConvEniEnt puBliC trAnsportAtion.