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Question 162·Hard·Text Structure and Purpose

The following text is from an early twentieth-century memoir. The narrator is waiting on a train platform.

I counted the lamps along the platform—eleven small suns burning their patience into the fog—and I told myself I waited only for the 6:10, nothing more. Yet each small inventory—of gloves in my pocket, of names on the departures board—seemed an audition for departure, as if by arranging these items in sequence I could persuade my legs to go. When the train pulled in and people moved with the certainty of errands, I remained where I was, cataloguing the sheen on the handrails, the note the whistle made, quieting my ledger with entries that did not add up to courage.

Which choice best describes the primary function of the narrator's listing of observations in the passage?