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Question 60·Hard·Text Structure and Purpose

In a recent lecture, economist Laila Moreno paused before her audience and asked, “Why do we still use money?” The question, offered as the opening gambit of her talk, seemed almost childlike in its simplicity. Moreno then traced the evolution of mediums of exchange—from seashells to smartphone apps—ultimately arguing that the endurance of money is less about economic efficiency than about social trust.

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