The answer is: [A]: emigrate. Β
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Your answer choice is correct!
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One "emigrates" FROM a place (and "immigrates" to a place).
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Note: Answer choices "B" and "C" are incorrect. These choices are "nouns"; and we need a "verb".
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Answer choice "D" is incorrect. Β It makes no sense. One does not "assault FROM" [a place to a place].