[单选题]
07.12: The definition of avkisi:.nzb8 +2h(a akherage veloy e3rsh0p.v1b+ y r:mqcity is
A. the average acceleration multiplied by the time.
B. distance traveled divided by the time.
C. $\frac{1}{2} (v_i + v_f)$
D. radius multiplied by angular velocity.
E. displacement divided by the time.
