If $f(x) = \frac{x}{1+x}$ and $g(x) = f(f(x))$, then $g^{\prime}(x)$ is equal to

  • A
    $\frac{1}{(2x+3)^2}$
  • B
    $\frac{1}{(x+1)^2}$
  • C
    $\frac{1}{x^2}$
  • D
    $\frac{1}{(2x+1)^2}$

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