题目内容：
Questionsarebasedonthefollowingpassage. Itisverywelltoblametrafficjams;thecostofpetrolandthequickpaceofmodernlife,butmannersontheroadsarebecominghorrible．Youmighttoleratetherudeandinconsideratedriver,butnowadaysthewell-manneredmotorististheexceptiontotherule．Perhapsthesituationcallsfora"BeKindtoOtherDrivers"campaign;otherwise,itmaygetcompletelyoutofhand.
Roadpolitenessisnotonlygoodmanners,butgoodsensetoo．Ittakesthemostcool-headedandgood-temperedofdriverstoresistthetemptationtorevengewhensubjectedtouncivilizedbehaviors．Ontheotherhand,alittlepolitenessgoesalongwaytowardsrelievingthetensionsofmotoring．Afriendlynodorawaveofacknowledgementinresponsetoanactofpolitenesshelpstocreateanatmosphereofgoodwillandtolerancesonecessaryinmoderntrafficconditions．Butsuchacknowledgementsofpolitenessarealltooraretoday．Manydriversnowadaysdon'tevenseemabletorecognizepolitenesswhentheyseeit.
However,improperpolitenesscanalsobedangerous．Atypicalexampleisthedriverwhowavesachildacrossintothepathofoncomingvehicles'~hatmaybeunabletostopintime．Thesamegoesforencouragingoldladiestocrosstheroadwhereverandwhenevertheycareto.
Aveterandriver,whosemannersarefaultless,toldmeitwouldhelpifmotoristslearntofiltercorrectlyintotrafficstreamswithoutcausingthetotalblockages(~)thatgiverisetobadtemper．Unfortunately,modernmotoristscannotevenlearntodrive,letalonebewell-manneredontheroad．Yearsago,theexpertswarnedusthatthecar-ownershipexplosionwoulddemandalotmotegive-and-takefromallroadusers．Itishightimeforallofustotakethismessagetoheart.
Accordingtothispassage,troublesontheroadareprimarilycausedby__________. A．people'sattitudetowardsdrivers
B．therhythmofmodernlife
C．trafficconditions
D．thebehaviorofthedriver
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答案解析：