thE suggEstion mADE By thE orgAnizAtion is to solvE thE proBlEm thAt________.
A．thErE is not Enough spACE For BuilDing CitiEs on lAnD
B．lAnD trAnsportAtion hAs BEComE inCrEAsingly DiFFiCult
C．thErE ArE too mAny pEoplE on lAnD
D．prEsEnt CitiEs ArE hEAvily pollutED By CArs