If $f:R \to R$ is a differentiable function and $f(2) = 6$,then $\lim_{x \to 2} \int_{6}^{f(x)} \frac{2t \, dt}{x - 2}$ is

  • A
    $0$
  • B
    $2f'(2)$
  • C
    $12f'(2)$
  • D
    $24f'(2)$

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