题目内容：
根据以下材料回答题 RobertSpring,a19thcenturyforger(伪造者),didwellinhisjobthathewasabletomakehislivingfor15yearsbysellingfalsesignaturesoffamousAmericans．SpringwasborninEnglandin1813andarrivedinPhiladelphiain1858toopenabookstore．AtfirsthemadesomemoneybysellinghissmallbutrealcollectionofearlyUSautographs(亲笔签名)．Discoveringhisabilityatcopyinghandwriting,hebegantolearnthesignaturesofGeorgeWashingtonandBenFranklinandwritethemonthetitlepagesofoldbooks．Toreducethechanceofbeingdiscovered,hesenthisworkstoEnglandandCanadaforsale．
Forgershaveadifficulttimesellingtheirproducts．Aforgercan'tgotoarespectablebuyerbutmustdealwithpeoplewhodon'thavemuchknowledgeinthefield．Forgershavemanywaystomaketheirworkslookreal．Forexample,theybuyoldbookstousetheagedpaperofthetitlepage,andtheytreatpaperandinkwithchemicals．
AftertheCivilWar,Britainwasstillfondofthesouthernstates,so,Springinventedare-spectableladyknownasMissFannyJackson,theonlydaughterofGeneral"StoneWall"Jackson．
ForseveralyearsMissFanny'smoneyproblemsforcedhertosellagreatnumberoflettersbelong-ingtoherfamousfather．Springhadtoworkveryhardtosatisfythedemand．AllthisactivitydidnotpreventSpringdyinginpoverty．
WhydidSpringsellhisfalseautographsinEnglandandCanada? A．TherewasagreaterdemandtherethaninAmerica．
B．Therewaslesschanceofbeingdiscoveredthere．
C．BritainwasSpring'sbirthplace．
D．ThepriceswerehigherinEnglandandCanada．
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