In $\triangle \mathrm{ABC}$ if $a=2 b$ and $|\mathrm{A}-\mathrm{B}|=\frac{\pi}{3}$, then $\angle \mathrm{C}=$

• A

  $\frac{\pi}{6}$
• Correct answer
  B

  $\frac{\pi}{3}$
• C

  $\frac{\pi}{2}$
• D

  $\frac{\pi}{4}$

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