AFtEr thE upwArping oF thE plAtEAu's surFACE in thE grAnD CAnyon ArEA, ______.
A．shAllow rivErs mEAnDErED in thE CAnyon
B．thE wholE ColorADo plAtEAu grADuAlly rusE
C．thrEE rivErs CAmE into BEing AnD Cut out A long trEnCh
D．DiFFErEnt mountAin rAngEs BulgED upwArDs