GMAT Sentence Correction (SC) | Re: #Top150 SC: There was great debate among Greek historians

if D has been given like this- 'had been great debate among Greek historians whether the city of Troy ever existed or was a figment of fiction,until the noted archaeologist Schliemann discovered in Turkey a site that many believe to be the ancient city of Troy, a discovery that has validated,

is it still correct to chose D?

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