The Emperor Wu of Han received reports of the tall and powerful horses ("heavenly horses") in the possession of the Dayuan, which were of capital importance to fight the nomad Xiongnu. The refusal of the Dayuan to offer them enough horses along with a series of conflicts and mutual disrespect resulted in the death of the Chinese ambassador and the confiscation of the gold sent as payment for the horses.
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Answer: D. He believes the Southern states are superior to the Northern states in every respect, and therefore it is best to secede.
Explanation: