问题: Whatissaidaboutcellphoneuseinparagraph4?
A: Thenumberofcellphonesinuseexplodedinthelate1980sandpartofthe1990s.
B:Thenumberoftrafficdeathswasreducedinthelate1980sandpartofthe1990sduetocellphoneuse.
C:ellphoneusersarelikelytobeinvolvedintrafficaccidents.
D:Theuseofcellphoneshasalife-savingeffectforpedestriansanddrivers.
