[单选题]
07.12: The definition of avfow-fu 9xmb0 /mj)u;gerage velocity isgf ,i )5m,ngrv
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.
