I'm pretty sure the answer is D
It would be (D) guarantees from leasehold nations that they would keep their Chinese ports open to all nations.
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The Open Door Policy was significant for the United States as it opened Chinese markets for American trade, marked a shift from isolationism to a view of the U.S. as a world power, and helped maintain a balance of power among nations in China. The policy allowed the U.S. to access lucrative markets without the need for territorial control, reflecting its growing influence. Based on these factors, the correct answer is (B) moving the American public away from isolationism and toward the view of the nation as a world power.
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