In the nuclear reaction,${ }_{90}^{234} Th \longrightarrow{ }_{91}^{234} Pa + X$,$X$ is:

  • A
    ${ }_{-1}^0 e$
  • B
    ${ }_1^0 e$
  • C
    $H$
  • D
    ${ }_1^2 H$

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