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Question 8·Medium·Text Structure and Purpose

The excerpt below is from a nineteenth-century novel in which the young narrator enters his guardian’s study for the first time.

The room was dim, the curtains drawn to a stubborn twilight. The map lay open on the desk, its coasts rimmed in red ink as if to warn me away. Dust rested on every brass instrument, and a clock ticked so slowly I wondered whether it kept time for anyone but itself.

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