题目内容：
根据以下材料，回答题 On-LineCancerChatwithaSafetyNet
CancerResearchUKhaslaunchedanonlinechatforumforcancerpatientstoswapstoriesandshareexperiencesonhowtocopewithsuchadevastatingdisease.
ButCancerChatisaforumwithadifference:ithasaninformationsafetynet.
ThismeansthataCancerResearchUKteamwillkeepawatchingbrieftoensurethatpatientsarenotsubjectedtorogue"cancercures"orscientificallyunsoundinformation．AnyonecanhaveaccesstothemessagespostedonCancerChatbutifpeoplewishtopostamessage,theywillneedtoregister.
AndRebekahGibbs,cancerpatientandstarofTV'sCasualtyhaspledgedhersupportforthenewproject．"IthinkCancerChatisabrilliantidea,"shesaid．"IhavewrittenapublicdiaryaboutwhatIwentthroughwithbreastcancerandIhavehadsuchaheart-warmingresponsefromotherpeoplegoingthrough,thesamething."TheideaofaCancerChatforummeansyoucanshareinformationabouttreatmentandsideeffectsandyoucanreallyopenupaboutyourfeelingsonlineinawaythatcanbedifficultwhentalkingtoclosefriendsandfamily．AndwithCancerResearchUKmonitoringtheforumpeoplecanbereassuredaboutthequalityofinformationbeingexchanged.
"CancerChatwillalsoencourageitsuserstocheckoutanycancerquestionsonitsCancerHelpUKwebsitewhichisspeciallydesignedtogivepatientsandtheirfamilies6,000pagesofup-to-dateinformationthatiseasytounderstandandexplainsawiderangeoftreatmentsfordifferenttypesofcancerandgivesdetailsofclinicaltrials．ThereisalsoaUKdatabaseofcancerclinicaltrials.
Theaward-winningwebsiteattractsaroundonemillionvisitorsamonthandCancerResearchUKhopesthatsomeofthesevisitorswillalsowanttopostcommentsontheCancerChatforum.
Forthosewhodonothaveaccesstocomputersandhavequestionsaboutcancer,thecharity'steamofcancerinformationnursesareavailableduringofficehourstotalkoverpatients'concernsonthephone.
CancerChatisdifferentfromotherforumsinthat__________. A．ithasthesupportofafamousactress
B．itisasourceofreliableinformation
C．itprovidesahugeamountofinformation
D．itattractsagreatnumberofvisitors
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