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Question 128·Medium·Text Structure and Purpose

Mrs. Langford paused at the threshold of the classroom, surveying the bright faces turned toward her. She cleared her throat, but her smile remained steady. What she said next seemed less addressed to her students than to herself. "We begin, not because we are ready, but because the moment asks it of us," she announced. The students looked at one another, unsure whether to nod or take notes, until Mrs. Langford strode to the board and began writing dates in bold strokes.

Which choice best describes the function of the underlined sentence in the overall structure of the text?