The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g.,line no. $5$ arises from the transition from level $B$ to $A$). Which of the following spectral lines will also occur in the absorption spectrum?

  • A
    $1, 4, 6$
  • B
    $4, 5, 6$
  • C
    $1, 2, 3$
  • D
    $1, 2, 3, 4, 5, 6$

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