A Wheel Rotates with a Constant Angular Acceleration Of $\pi$ Rad/s² $\pi$

Multiple Choice

A wheel rotates with a constant angular acceleration of $\pi$ rad/s².During a certain time interval its angular displacement is $\pi$ rad.At the end of the interval its angular velocity is 2 $\pi$ rad/s.Its angular velocity at the beginning of the interval is:

A) "0 rad/s"
B) "1 rad/s"
C) " $\pi$ rad/s"
D) "rad/s"
E) "2 $\pi$ rad/s"