ACCorDing to thE tAlk, whAt DiD DAviD sArnoFF prEDiCt ABout rADios
A．thEy woulD gEt smAllEr in sizE.
B．thEir signAls woulD trAvEl FurthEr.
C．thEy woulD BEComE lEss populAr thAn tElEvision.
D．thEy woulD BE Common housEholD itEms.