题目内容：
根据下面内容，回答题 Imaginethemostfamouspersonyouknow,MichaelJordan,BritneySpears,PrinceWilliam.Nowthinkofthis:NotoneofthemisasfamousasHelenKellerwasinherday.
Backinthelatel$00s,nobodybelievedthatblindordeafpeoplecouldleadnormallives.Mostweresentawayfromtheirhomes.
Theylivedinschoolsthatweremorelikeprisonthanplacestolearnandgrow.Fewpeoplebelievedthatapersonwhowasbothblindanddeafcouldeverlearntocommunicate.ButAnnieSullivanbelievedshecouldteach7-year-oldHelenKellerlanguage.
WhenAnniefirstmetHelenin1887,Helenwaswildandangry.Shespokebygrunting(咕哝)andscreaming.Nobody,notevenHelen'sparents,believedAnniewouldsucceed.Andwhenshedidsucceed,newsofthismiracle(奇迹)spreadfar.
Helenoftensaidthatshehadspentherearlychildhoodina"dungeon(地牢)ofsilence"andloneliness.FreedfromthisdungeonbyAnnie,Helenblossomed.BytheageoflO,HelenwasabletowriteandreadBraille.InadditiontoEnglish,HelenalsolearnedFrenchandGreek:SheevenlearnedtotalkclearlyenoughsothatAnniecouldunderstandher.
Shebecameanauthor,writing13booksandhundredsofarticles.SheandAnnietraveledaroundtheworld.Shelearnedtorideahorseandabike.Whenshedied,justbeforeher88thbirthday,shehadbecomeoneofAmerica'sgreatheroes.
"Life,"Helenoncesaid,"iseitheradaringadventureornothing".
Whoisconsideredthemostfamouspersonaccordingtotheabovepassage? A．MichaelJordan.
B．PrinceWilliam.
C．HelenKeller.
D．BritneySpears.
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