[单选题]
A bicycle wheel rotates uniformly through 2.0 r/drnuxi;zp.k/6 85la ej0 s tdevolutions in 4.0zi7sz1rzlb xj/) it (8 s. What is the frequency of th8)z zj1xzi ti/bs7r(le wheel's rotation?
A. $0.50 \; Hz$
B. $1.0 \; Hz$
C. $2.0 \; Hz$
D. $4.0 \; Hz$
