$_{90}^{232}Th$ an isotope of thorium decays in ten stages emitting six  $\alpha$-particles and four $\beta$-particles in all. The end product of the decay is

  • A

    $_{82}^{206}Pb$

  • B

    $_{82}^{209}Pb$

  • C

    $_{82}^{208}Pb$

  • D

    $_{83}^{209}Br$

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