If $\vec{a}, \vec{b}, \vec{c}$ are unit vectors such that $\vec{a}+\vec{b}+\sqrt{3} \vec{c}=\overrightarrow{0}$, then the angle between $\vec{a}$ and $\vec{b}$ is

• A

  $\frac{\pi}{4}$
• B

  $\frac{\pi}{2}$
• Correct answer
  C

  $\frac{\pi}{3}$
• D

  $\frac{\pi}{6}$

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