If $A = 1 + r^z + r^{2z} + r^{3z} + \dots \infty$,then the value of $r$ is:

  • A
    $A(1 - A)^z$
  • B
    $\left( \frac{A - 1}{A} \right)^{1/z}$
  • C
    $\left( \frac{1}{A} - 1 \right)^{1/z}$
  • D
    $A(1 - A)^{1/z}$

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