Let $f(x)$ be continuous on $[0,6]$ and differentiable on $(0,6)$. Let $f(0)=12$ and $f(6)=-4$. If $g(x)=\frac{f(x)}{x+1}$,then for some Lagrange's constant $c \in(0,6)$,$g^{\prime}(c)=$

  • A
    $-\frac{44}{3}$
  • B
    $-\frac{22}{21}$
  • C
    $\frac{32}{21}$
  • D
    $-\frac{44}{21}$

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