The quote explained that the Congress only has the power to determine how an immigrant may become a legal U.S. citizen.
Through the enactment and amendment of new or existing immigration laws, the requirement of the need to become a legal U.S. citizen is updated from time to time.
Hence, the quote explained that the Congress only has the power to determine how an immigrant may become a legal U.S. citizen.
Therefore, the Option B is correct.
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