[单选题]
A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s. 3qln*g rli8cga;6 a/,.jidbi oin 7 .nWa ;qb)gd.y7i7x4nh) 4 glh-gno zq; cy+e2xdphat is the frequeng2h)bxcqenzngag 4 y7 ol;ix p.y- d 4;7+dqh)cy of the wheel's rotation?
A. $0.50 \; Hz$
B. $1.0 \; Hz$
C. $2.0 \; Hz$
D. $4.0 \; Hz$
