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Question 12·Hard·Text Structure and Purpose

In her recent lecture, historian Maya Fernandez revisited the 15th-century voyages of Zheng He, arguing that they were less about exploration than about projecting Ming China’s domestic political stability. She counters the prevailing view that the massive treasure fleets prove an outward-looking court eager for trade and discovery. Indeed, Fernandez notes that the emperor issued strict orders forbidding captains from sailing to any port that had not already sent tribute, a policy that effectively limited the fleets to familiar diplomatic circuits. Such an emphasis, she contends, reframes the voyages as strategic displays intended primarily for an audience back home rather than genuine expeditions of discovery.

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