[单选题]
A bicycle wheel rotates uniformly s,wdbimxj po*6y/m, b:j b3(/l fz2-6ipajqo throi;vhg)jo0/ zpkf4ech4 yvl ( vdj;-k;ugh 2.0 revolutions in 4.0 s. What is the z d4 geij(;v-4h;fkc/ ;vl0k vjyh)poaverage angular speed of the wheel?
A. 0.79 rad/s
B. 1.6 rad/s
C. 3.1 rad/s
D. 6.3 rad/s