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Question 109·200 Super-Hard SAT Reading Questions·Expression of Ideas

After a university library digitized a substantial portion of its manuscript collection, the digitized works were cited in scholarly publications more often than they had been previously. Library administrators took the increase as evidence that digitization had broadened researchers' engagement with the collection. ______ a later analysis found that almost all of the new citations referred to a small group of manuscripts that had already been well known, while citation rates for less familiar works remained nearly unchanged.

Which choice completes the text with the most logical transition?