In the nuclear decay sequence given below:
$_Z{X^A} \to {}_{Z + 1}{Y^A} \to {}_{Z - 1}{K^{A - 4}} \to {}_{Z - 1}{K^{A - 4}}$
the particles emitted in the sequence are:

  • A
    $\alpha, \beta, \gamma$
  • B
    $\beta, \alpha, \gamma$
  • C
    $\gamma, \alpha, \beta$
  • D
    $\beta, \gamma, \alpha$

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Which of the following is not emitted during the radioactive decay of a radioactive element?

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