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Answer is Wrong!
Answer is Right!
Option A is incorrect because it includes the point $z=3$, which is not in the region of convergence of $x_1[n] – x_2[n]$. Option B is incorrect because it includes the point $z=2$, which is not in the region of convergence of $x_1[n] – x_2[n]$. Option C is incorrect because it includes the point $z=3/2$, which is not in the region of convergence of $x_1[n] – x_2[n]$.