Let $P, Q$ be the foci of an ellipse and let $R$ be one end of its minor axis. If $\triangle P Q R$ is an equilateral triangle, then the eccentricity of the ellipse is equal to

• Correct answer
  A

  $\frac{1}{2}$
• B

  $\frac{1}{4}$
• C

  $\frac{1}{8}$
• D

  $\frac{1}{6}$

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