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Question 127·200 Super-Hard SAT Reading Questions·Craft and Structure

A literary critic discussing Nadiya Vale's novel "Morrow House" notes that the alternating accounts of two estranged sisters initially seem to establish a simple opposition: Amara's memories are associative and image-filled, whereas Leven's inventory-like narration appears exact. Midway through the novel, however, both sisters describe a childhood fire. Leven's supposedly exact account repeats an impossible detail about blue lilacs from Amara's memories, while Amara unexpectedly records times in Leven's distinctive phrasing. The scene does not merely blur the distinction between the sisters' styles; it makes that distinction newly legible as something each sister has learned from the other. Thereafter, the accounts retain different rhythms, but images and details increasingly migrate between them. The novel ultimately presents identity not as isolated and fixed but as shaped through unacknowledged exchange.

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