The range of $\sin^{-1}\left(\frac{1+x^2}{2+x^2}\right)$ is:

  • A
    $[ -\frac{\pi}{6}, \frac{\pi}{6} ]$
  • B
    $[ 0, \frac{\pi}{2} )$
  • C
    $[ -\frac{\pi}{2}, \frac{\pi}{2} ]$
  • D
    $[ \frac{\pi}{6}, \frac{\pi}{2} )$

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