$\int_9^x \frac{f(y)}{y^2} \, dy = 2 \sqrt{x} - 6 \implies f(x) = ?$

  • A
    $\sqrt{x}$
  • B
    $x \sqrt{x}$
  • C
    $x^2 \sqrt{x}$
  • D
    $x + \sqrt{x}$

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