If $\bar{a}, \bar{b}$ are two non-parallel unit vectors and the vector $\alpha \bar{a}+\bar{b}$ bisects the internal angle between $\bar{a}$ and $\bar{b}$, then $\alpha$ is equal to

• Correct answer
  A

  $1$
• B

  $\frac{1}{2}$
• C

  $2$
• D

  $3$

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