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Question 56·200 Super-Hard SAT Reading Questions·Craft and Structure

Architectural historians disagree about how three seventeenth-century plans produced in the Maren workshop came to share the same inaccurate angle for a tower wall. Sel argues that the draftspeople copied a common master drawing; Ivo argues that they surveyed the same partly collapsed building independently. Infrared imaging has revealed guidelines matching a surviving master drawing beneath the first two plans, but not beneath the third, which also depicts repairs absent from the other plans. Workshop records date the first two plans to before those repairs and the third to after them, although all three preserve the inaccurate tower angle. Contemporary inspection notes report that the repairs stabilized the tower without changing the wall’s angle.

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