单选题：DeepinsideamountainnearSweetwaterinEast.Tennesseeisabodyofwa

题目内容：

DeepinsideamountainnearSweetwaterinEast.TennesseeisabodyofwaterknownastheLostSea.ItislistedbytheGuinnessBookofWouldRecordsastheworld’slargestundergroundlake.TheLostSeaispartofanextensiveandhistoriccavesystemcalledCraigheadCaverns.
ThecavernshavebeenknownandusedsincethedaysoftheCherokeeIndiannation.Thecaveexpandsintoaseriesofhugeroomsfromasmallopeningonthesideofthemountain.Approximatelyonemilefromtheentrance,inaroomcalled“TheCouncilRoom,”manyIndianartisfactshavebeenfound.Someoftheitemsdiscoveredincludepottery,arrowheads,weapons,andjewelry.
Formanyyearstherewerepersistentrumorsofalargeundergroundlakesomewhereinacave,butitwasnotdiscovereduntil1905.Inthatyear,athirteen-year-oldboynamedBenSandscrawledthroughasmallopeningthreehundredfeetunderground.Hefoundhimselfinalargecavehalffilledwithwater.
TodaytouristsvisittheLostSeaandridefaroutontoitinglass-bottomedboatspoweredbyelectricmotors.Morethanthirteenacresofwaterhavebeenmappedoutsofarandstillnoendtothelakehasbeenfound.EventhoughteamsofdivershavetriedtoexploretheLostSea,thefullextentofitisstillunknown.
TheLostSeaisuniquebecauseitis________.
A.partofahistoricalcavesystem
B.thebiggestundergroundlakeintheworld
C.listedintheGuinnessBookofWorldRecords
D.thelargestbodyofwaterinTennessee

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单选题：DeepinsideamountainnearSweetwaterinEast.Tennesseeisabodyofwa

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