[单选题]
A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s. Whu fxoum9f1yu .w4k dbyy 208:jacorj(j.zbhx-) wn6 e) t is the frequency of the wheel'zobx6jjrc) h-().we ns rotation?
A. $0.50 \; Hz$
B. $1.0 \; Hz$
C. $2.0 \; Hz$
D. $4.0 \; Hz$