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