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Question 123·Hard·Text Structure and Purpose

The following text is from a contemporary essay by a museum director.

The museum once measured success by the thud of ticket stubs. After a few years of listening to visitors, we understood that numbers could grow while the rooms still felt unwelcoming. Hospitality, we realized, is not a slogan but a chain of small, specific decisions. We moved benches to the first gallery, translated the labels that visitors most often photographed, reopened the side entrance so parents with strollers wouldn’t have to wrestle the steps, and asked docents to wait one breath longer before offering help. Attendance did not surge; the thank-you notes did.

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