题目内容：
根据以下材料，回答题Sincethe1970s,scientistshavebeensearchingforwaystolinkthebrainwithcomputers.Brain-computerinterface(BCI)technologycouldhelppeoplewithdisabilitiessendcommandstomachines.Recently,tworesearchers,JoseMillanandMicheleTavellafromtheFederalPolytechnicschoolinLausanne,Switzerland,demonstrated(展示)asmallroboticwheelchairdirectedbyaperson'sthoughts.Inthelaboratory,Tavellaoperatedthewheelchairjustbythinkingaboutmovinghisleftorrighthand.Hecouldeventalkashewatchedthevehicleandguideditwithhisthoughts."Ourbrainhasbillionsofnerveceils.Thesesendsignalsthroughthespinalcord(骨髓)tothemusclestogiveustheabilitytomove.Butspinalcordinjuriesorotherconditionscanpreventtheseweakelectricalsignalsfromreachingthemuscles,"Tavellasays,"Oursystemallowsdisabledpeopletocommunicatewithexternalworldandalsotocontroldevices."Theresearchersdesignedaspecialcapfortheuser.Thisheadcoverpicksupthesignalsfromthescalpandsendsthemtoacomputer.Thecomputerinterpretsthesignalsandcommandsthemotorizedwheelchair.Thewheelchairalsohastwocamerasthatidentifyobjectsinitspath.Theyhelpthecomputerreacttocommandsfromthebrain.Prof.Millan,theteamleader,saysscientistskeepimprovingthecomputersoftwarethatinterpretsbrainsignalsandturnsthemintosimplecommands."ThepracticalpossibilitiesthatBC!technologyofferstodisabledpeoplecanbegroupedintwocategories:communicationandcontrollingdevices.Oneexampleisthiswheelchair."
Hesayshisteamhassettwogoals.Oneistestingwithrealpatients,soastoprovethatthisisatechnologytheycanbenefitfrom.Andtheotheristoguaranteethattheycanusethetechnologyoverlongperiodsoftime.
BCIisatechnologythatcan A．helptoupdatecomputersystems
B．linkthehumanbrainwithcomputers
C．helpthedisabledtorecover
D．controlaperson'sthoughts
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