Answer: A minority party of Cherokees concluded that their only course was to negotiate a removal treaty with the United States. ... The treaty, signed at New Echota, Georgia, in December 1835, established a deadline of two years for the Cherokees to leave their homelands.
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Under the leadership of Russian communist revolutionary Vladimir Lenin, the Bolshevik Party seized power in the Russian Republic during a coup known as the October Revolution.
The correct answer is D, because "their" signifie that they are having "their" conversation, and that they own the conversation. C is incorrect because "there" describes where, B is incorrect because "they" describe who, and A is incorrect because "they are" doesn't grammatically or sensibly fit in, so the answer is D.