Which of the following sequences is correct according to the Aufbau principle?

  • A
    $3s < 3d < 4s < 4p$
  • B
    $1s < 2p < 4s < 3d$
  • C
    $2s < 5s < 4p < 5d$
  • D
    $2s < 2p < 3d < 3p$

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