The value of $c$ for the Lagrange's mean value theorem for $f(x)=\sqrt{x^2-x}, x \in[1,4]$ is

  • A
    $\frac{4}{3}$
  • B
    $\frac{3}{2}$
  • C
    $\frac{5}{4}$
  • D
    $3$

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