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Question 3·Medium·Text Structure and Purpose

The following passage describes a first day on the job at a bakery.

The first time I worked the morning shift at the bakery, the streetlights were still flickering when I unlocked the back door. The kitchen smelled like last night's sugar clinging to the air. I stacked trays and studied the schedule, trying not to look nervous. My supervisor had scrawled 'remember the steam' in the margin, which I took as both warning and welcome. I wanted to do everything properly: measure to the gram, sweep between batches, keep the ovens honest. But as the mixers started, I realized we were all following a choreography the room already knew: metal on wood, timer bell, a hiss from the vents. When I matched my steps to that rhythm, the work stopped feeling like a test.

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