Let $f(x)$ be continuous on $[0,4]$, differentiable on $(0,4)$, $f(0)=4$ and $f(4)=-2$. If $g(x)=\frac{f(x)}{x+2}$, then the value of $g^{\prime}(c)$ for some Lagrange's constant $c \in (0,4)$ is

  • A
    $\frac{1}{2}$
  • B
    $\frac{5}{12}$
  • C
    $-\frac{5}{12}$
  • D
    $-\frac{7}{12}$

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