If $a_1, a_2, \dots, a_n$ are positive real numbers whose product is a fixed number $c$,then the minimum value of $a_1 + a_2 + \dots + a_{n-1} + 2a_n$ is

  • A
    $n(2c)^{1/n}$
  • B
    $(n + 1)c^{1/n}$
  • C
    $2nc^{1/n}$
  • D
    $(n + 1)(2c)^{1/n}$

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