Actinium $231$, ${}^{231}A{c_{89}}$, emit in succession two $\beta  - $particles, four alphas, one $\beta  $ and one alpha plus several $\gamma $ rays. What is the resultant isotope

  • [AIIMS 2011]
  • A

    $^{221}A{u_{79}}$

  • B

    $^{211}A{u_{79}}$

  • C

    $^{221}P{b_{82}}$

  • D

    $^{211}P{b_{82}}$

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  • [AIIMS 2006]