$_{89}Ac^{231}$ gives $_{82}Pb^{207}$ after the emission of some $\alpha$ and $\beta$ particles. The number of such $\alpha$ and $\beta$ particles are respectively:

  • A
    $5, 6$
  • B
    $6, 5$
  • C
    $7, 5$
  • D
    $5, 7$

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