quEstions rEFEr to thE Following grAph.

AssumE thAt in 1990 thErE wErE 3,000,000 Fourth-grADErs in thE unitED stAtEs. how mAny FEwEr oF thosE 3,000,000 stuDEnts usED A ComputEr in sChool At lEAst onCE A wEEk in 1994 thAn in 1990A．100,000
B．250,000
C．500,000
D．600,000
E、750,000