If $\tan \theta + \tan \left(\theta + \frac{\pi}{3}\right) + \tan \left(\theta + \frac{2\pi}{3}\right) = 3$,then which of the following is equal to $1$?

  • A
    $\tan 2\theta$
  • B
    $\tan 3\theta$
  • C
    $\tan^2 \theta$
  • D
    $\tan^3 \theta$

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