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Question 175·200 Super-Hard SAT Reading Questions·Craft and Structure

When two editions of the anonymously published 1794 novel "The Glass Orchard" were found to contain substantial wording differences, scholars commonly treated the later edition as an author’s revision. Leila Moreno notes, however, that the later edition could instead descend from a printer’s working copy that typesetters had modified. For Moreno, therefore, the important question is not simply whether the editions differ but whether their differences bear the irregular signature of copying or the consistent pattern expected of deliberate revision. Her comparison found that changes in the opening chapters were scattered and often produced awkward repetitions, whereas changes in the closing chapters consistently compressed descriptive passages without disturbing the syntax. Moreno attributed the first group to printing-house intervention but judged the second compatible with authorial revision.

Which choice best describes the function of the underlined sentence in the text as a whole?