题目内容：
Questionsarebasedonthefollowingpassage． Thenumberofpostgraduatestudentstravellingfromnon-EUcountriestostudyatUKuniversitieshasfallenforthefirsttimein16years,fuellingfearsthatthegovernment'simmigrationcrackdownisdiscouragingthousandsofthebrighteststudentsfromcontinuingtheirstudiesinBritain．
JoBeali,BritishCouncildirectorofeducationandsociety,saidthefallwouldcausealarmamongUKvice-chancellors(大学生行政主管)．"Thesectorwasexpectingadeclineingrowth,buttheactualreductioninpostgraduatenumbersisofrealconcernasinternationalstudentsmakeupthemajorityofnumbersinmanypostgraduatecoursesandresearchteamsinscience,tectmology,engineeringandmathematics．"AttractingthebrightestandmostambitiouspostgraduateandresearchstudentsiscriticalfftheUKistomaintainitsqualityreputationforresearch,"Beallsaid．Universitiesgetathirdoftheirtuition(学费)feerevenuefromnon-EUstudents．Thereisgrowing"fearamongvice-chancellorsthatthisrevenue--aswellasthecultural,academicandeconomicbenefitinternationalstudentsbring--isbeingputatrisk．TimWestlake,directorforthestudentexperienceatManchesterUniversity,saidstudentswhosefamiliesreliedonthemworkingintheUKaftertheirstudiestogainexperienceandrepaythefeeswerestartingtolookelsewhere．Lastmonththehomesecretary,TheresaMay,announcedthatembassystaffwouldinterviewmorethan100,000applicmptsinanattempttopreventbogus(假冒的)onesenteringthecountry．ShealsosaidimmigrantswereresponsibleforpushingupUKhouseprices．Thecommentsfollowedtheintroductionofnewlimitationsonstudents'righttoworkduringandaftertheirstudies．Beailsaid:"GovernmentstatisticsforthefasttimeproviderealevidencethatthechangestoUKvisaregulationsmayhavediscouragedmanystudentsfromapplyingtotheUK,andinparticularpostgraduatestudentswhoaresoimportanttotheUK'sresearchoutput．TheUKenjoysanexcellentreputationaroundtheworldforthehighqualityofoureducationsystem,sothegovernmentneedstoensurethatinstitutionshaveallthesupporttheyneedtoattractinternationalstudentswhomakeatremendousacademic,culturalandeconomiccontributiontotheUK"
Whathascausedthedeclineofthenmnberofnon-EUpostgraduatesintheUK? A．Theincreaseintuitionandfees．
B．Theever-risinglivingexpenses．
C．Changedinunigrationpolicies．
D．Universities'tightenedbudgets．
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答案解析：