The solution set of the equation $\sin^{-1} x = 2\tan^{-1} x$ is

  • A
    $\{1, 2\}$
  • B
    $\{-1, 2\}$
  • C
    $\{-1, 1, 0\}$
  • D
    $\{1, \frac{1}{2}, 0\}$

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