Consider the following statements $A$ and $B$. Identify the correct choice in the given answers.
$A$. The refractive index of the extra-ordinary ray depends on the angle of incidence in double refraction.
$B$. The vibrations of light waves acquire one-sidedness for both ordinary and extraordinary rays in double refraction.

• A
  $A$ and $B$ are wrong
• B
  $A$ and $B$ are correct
• C
  $A$ is correct and $B$ is wrong
• D
  $A$ is wrong and $B$ is correct