问题: Whatissaidaboutcellphoneuseinthemid-1980sinparagraph5?
A: Ithadalife-takingeffectbecausethereweren'tenoughcellphonesinusethen.
B:Theincreaseduseofcellphonesthencauseda"life-takingeffect."
C:Trafficfatalitiesincreasedthenbecausethenumberofcellphonesinusedecreased.
D:Trafficfatalitiesdecreasedthenbecausethenumberofcellphonesinuseincreased.
