If $\theta = \frac{\pi}{6}$,then the $10^{\text{th}}$ term of the series $1 + (\cos \theta + i \sin \theta)^1 + (\cos \theta + i \sin \theta)^2 + \dots$ is

  • A
    $-1$
  • B
    $-i$
  • C
    $\frac{1}{2} + \frac{\sqrt{3} i}{2}$
  • D
    $1$

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