题目内容：
根据以下材料，回答题AnideathatstartedinSeattle'spubliclibraryhasspreadthroughoutAmericaandbeyond.Theconceptissimple:helptobuildasenseofcommunityinacitybygettingeveryonetoreadthesame
bookatthesametime.
Inadditiontoencouragingreadingasapursuittobeenjoyedbyall,theprogramallowsstrangerstocommunicatebydiscussingthebookonthebus,aswellaspromotingreadingasanexperience
tobesharedinfamiliesandschools.TheideacamefromSeattlelibrarianNancyPearlwholaunchedthe"IfAllofSeattleReadtheSameBook"projectin1998.Heroriginalprogramusedauthor
visits,studyguidesandbookdiscussiongroupstobringpeopletogetherwithabook,buttheideahassinceexpandedtomanyotherAmericancities,andeventoHongKong.
InChicago,themayorappearedontelevisiontoannouncethechoiceofToKillaMockingbirdasthefirstbookinthe"OneBook,OneChicago"program.Asaresult,readingclubsandneighbor-hoodgroupsspranguparoundthecity.AcrosstheUS,storiesemergedofparentsandchildrenreadingtoeachotheratnightandstrangerschattingawayonthebusaboutplotandcharacter.
TheonlyproblemaroseinNewYork,wherelocalreaderscouldnotdecideononebooktorepresentthehugeanddiversepopulation.Thismayshowthattheideaworksbestinmedium-sizedcitiesorlargetowns,whereagreatersenseofunitycanbeachieved.OritmayshowthatNewYorkersrathermissedthepoint,puttingalltheirenergyandpassionintothechoiceofthebook
ratherthandiscussionaboutabookitself.
Ultimately,asNancypointsout,thelevelofsuccessisnotmeasuredbyhowmanypeoplereadabook,butbyhowmanypeopleareenrichedbytheprocessorhaveenjoyedspeakingtosomeone
withwhomtheywouldnototherwisehavesharedaword.
WhatisthepurposeoftheprojectlaunchedbyNancy? A．Toinviteauthorstoguidereaders
B．Toencouragepeopletoreadandshare
C．Toinvolvepeopleincommunityservice
D．Topromotethefriendshipbetweencities
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答案解析：