A nucleus  $_n{X^m}$ emits one $\alpha$ particle and two $\beta$ particles. The resulting nucleus is

  • [AIPMT 2011]
  • A

    $_n{X^{m - 4}}$

  • B

    $_{n - 2}{Y^{m - 4}}$

  • C

    $_{n - 4}{Z^{m - 4}}$

  • D

    $_{n - 1}{Z^{m - 4}}$

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