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Question 78·Hard·Text Structure and Purpose

The following text is adapted from an 1890s novel. Clara has just arrived at a grand social event.

Clara paused at the threshold of the ballroom, hearing the bright chatter swirl around her like wind through glass. She had attended such gatherings often enough to know their choreography: greetings spun into compliments, compliments into careless gossip, and finally all into forgetfulness by dawn. She lingered, watching the sequence unfold as though it were a mechanical toy wound up for her inspection, a spectacle both intricate and inevitable, and she felt herself positioned oddly outside its clockwork. Only after taking that measure of distance did she step forward, fastening a smile that matched the glitter of the chandeliers.

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