$\int_8^{18} \frac{1}{(x+2) \sqrt{x-3}} d x=$

• Correct answer
  A

  $\frac{\pi}{6 \sqrt{5}}$
• B

  $\frac{\pi}{6}$
• C

  $\frac{\pi}{3}$
• D

  $\frac{\pi}{3 \sqrt{5}}$

Hence, the correct answer is option: 'A'.