题目内容：
根据下列材料，请回答题：SanFranciscohasitscablecars.SeattlehasitsSpaceNeedle.And,Longviewhasitssquirrelbridge.Thebridge,whichhasattractedinternationalattention,isnowalocallandmark.TheNuttyNarrowsBridgewasbuiltin1963byalocalbuilder,AmosPeters,togivesquirrelsawaytocrossthebusyroadwithoutgettingflattenedbypassingcars.
TheoriginalbridgewasbuiltoverOlympiaWayonthewestedgeofthelibrarygrounds.Beforethebridgewasbuilt,squirrelshadtoavoidtraffictoandfromtheParkPlazaofficebuildingwhereofficestaffputoutanuttyfeastforthesquirrels.Manytimes,PetersandotherswhoworkedinandnearParkPlazawitnessedsquirrelsbeingrunover.
OnedayPetersfoundadeadsquirrelwithanutstillinitsmouth,andthatday’scoffeebreakdiscussionturnedintosquirrelsafety.ThegroupofbusinessmencookedupthesquirrelbridgeideaandformedacommitteetoasktheblessingoftheCityCouncil(市政会).TheCouncilapproved,andCouncilwomanBessLaRivierenamedthebridge“NuttyNarrows.”
Afterarchitectsdesignedthebridge,AmosPetersandBillHutchstartedConstruction,Theybuiltthe60-footbridgefromaluminumandlengthsoffirehose(消防水带).Itcost1,000.
Itdidn’ttakelongbeforereportsofsquirrelsusingthebridgestarted.Squirrelswereevenseenguidingtheiryoungandteachingthemtheropes.Thestorywaspickedupbythemedia,andNuttyNarrowsbecameknowinnewspapersallovertheworld.
In1983,after20yearsofuse,Peterstookdowntheworn-outbridge.Repairsweremadeandcrosspieceswerereplaced.ThefadedsignwasrepaintedandinJuly1983,hundredsofanimalloversattendedthecompletionceremonyofthenewbridge.
Petersdiedin1984,andaten-footwoodensquirrelsculpturewasplacednearthebridgeinmemoryofitsbuilderandhisdevotiontotheproject.TheNuttyNarrowsBridgewasbuiltinorderto________. A．offersquirrelsaplacetoeatnuts
B．setupalocallandmark
C．helpimprovetraffic
D．protectsquirrels
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