题目内容：
根据短文，回答题DuBoiswasasociologicalandeducationalpioneerwhochallengedtheestablishedsystemofeducationthattendedtorestrictratherthantoadvancetheprogressofblackAmericans．Hechallengedwhatiscalledthe“Tuskegeemachine”ofBookerT．Washington，theleadingeducationalspokespersonoftheblacksintheUS.Asociologistandhistorian，DuBoiscalledforamoredeterminedandactivistleadershipthanWashingtonmovidedUnlikeWashington，whoserootswerethesouthernblackagriculture，DuBois'scareerspannedbothsidesoftheMason-DixonLine．HewasanativeofMassachusetts，receivedhisundergraduateeducationfromFiskUniversityinNashville，didhisgraduatestudyatHarvardUniversity，anddirectedtheAtlantaUniversityStudiesofBlackAmericanLifeintheSouth．DuBoisapproachedtheproblemofracialrelationsintheUnitedStatesfromtwodimensions：asascholarlyresearcherandasanactivistforcivilrights．Amonghisworkswasthefamousempiricalsociologicalstudy，ThePhiladelphiaNegr0：ASocialStudy，inwhichheexaminedthatcity’sblackpopulationandmaderecommendationsfortheschoolsystem．DuBois’s.PhiladelphiastudywasthepioneerworkonurbanblacksinAmerica．
DuBoishadalongandactivecareerasaleaderinthecivilrightsmovement．HehelpedtoorganizetheNiagaraMovementinl905，whichledtotheNationalAssociationfortheAdvancementofColoredPeople(NAACP)，establishedinl909．Froml910untill934，DuBoiseditedTheCrisis，themajorjournaloftheNAACP．Intermsofitseducationalpolicy，theNAACPpositionwasthatallAmericanchildrenandyouthshouldhavegenuineequalityofeducationalopportunity．Thispolicy，whichDuBoishelpedtoformulate，stressedthefollowingthemes：(1)publicschoolingshouldbefreeandcompulsoryforallAmericanchildren；(2)secondaryschoolingshouldbeprovidedforallyouth；(3)highereducationshouldnotbemonopolizedbyanyspecialclassorrace．
Asaleaderineducation，DuBoischallengednotonlythetraditionofracialsegregationintheschoolsbutalsotheaccommodationistideologyofBookerT．DuWashington．ThemajordifferencebetweenthetwomenwasthatWashingtonsoughtchangethatwasevolutionaryinnatureanddidnotupsetthesocialorder，whereasDuBoisdemandedimmediatechange．DuBoisbelievedineducatedleadershipforblacks，andhedevelopedaconceptreferredtoasthe“talentedtenth”，accordingtowhichlopercentoftheblackpopulationwouldreceiveatraditionalcollegeeducationinpreparationforleadership．ComparedwithB．T．Washington，DuBois’politicalstandwas___________． A．lesspopular
B．Imoreradical
C．lessaggressive
D．moreconservative
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