The radionuclide $_{90}^{234}Th$ undergoes two successive $\beta$-decays followed by one $\alpha$-decay. The atomic number and the mass number respectively of the resulting radionuclide are

  • A
    $92$ and $234$
  • B
    $94$ and $230$
  • C
    $90$ and $230$
  • D
    $92$ and $230$

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