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Question 88·Easy·Text Structure and Purpose

The following text is adapted from a 1903 magazine essay on steady work.

Great achievements are seldom the offspring of sporadic bursts of effort. They grow instead from the patient accumulation of small habits. A brick laid today seems trivial; a thousand such bricks become a cathedral. And yet how many abandon the work when they cannot see the spire? Who, after all, delights in the scaffolding? We praise the finished arch, but impatience seldom waits to place the final stone.

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