The sum of $n$ terms of the series $12 + 16 + 24 + 40 + \dots$ is

  • A
    $2(2^n - 1) + 8n$
  • B
    $2(2^n - 1) + 6n$
  • C
    $3(2^n - 1) + 8n$
  • D
    $4(2^n - 1) + 8n$

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