If $\log_{\pi}x > 0$,then the value of $\log_{\pi}\left( \sin^{-1}\frac{2x}{1+x^2} + 2\tan^{-1}x \right)$ is equal to

  • A
    $-1$
  • B
    $0$
  • C
    $1$
  • D
    $\pi$

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