If $\lim _{x \rightarrow 0} \frac{\sin ^{-1} x - \tan ^{-1} x}{3 x^{3}}$ is equal to $L$,then the value of $(6L + 1)$ is

  • A
    $1/6$
  • B
    $1/2$
  • C
    $6$
  • D
    $2$

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