${ }_{92}^{235} U$ atom disintegrates to ${ }_{82}^{207} Pb$ with a half-life of $10^9 yr$. In the process, it emits $7 \alpha$ particles and $n \beta^{-}$particles. Here, $n$ is

  • [KVPY 2009]
  • A

    $7$

  • B

    $3$

  • C

    $4$

  • D

    $14$

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