A rotating wheel has a constant angular acceleration. It has an angular velocity of 5.0 rad/s at time t = 0 s, and 3.0 s later has an angular velocity of 9.0 rad/s. What is the angular displacement of the wheel during the 3.0-s interval?
a. 21 rad
b. 15 rad
c. 27 rad
d. There is not enough information given to determine the angular displacement.