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Question 188·200 Super-Hard SAT Reading Questions·Craft and Structure

Critics often treat the frequent self-corrections made by the narrator in M. Salas's novel "The Distant Room" as straightforward signs of unreliability. A study of the novel's drafts, however, found that Salas added most of the corrections late in revision. Significantly, the only memories the narrator never corrects are also the only ones that another character later recounts. This correspondence does not establish that those memories are accurate, since the later accounts disagree on key details. Instead, it suggests that the narrator corrects memories that no one else can corroborate, making the habit a sign not just of uncertain recall but also of social isolation.

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