The $G.M.$ of the numbers $3, 3^2, 3^3, ..., 3^n$ is

  • A
    $3^{\frac{2}{n}}$
  • B
    $3^{\frac{n+1}{2}}$
  • C
    $3^{\frac{n}{2}}$
  • D
    $3^{\frac{n-1}{2}}$

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