[单选题]
04.08: The diagram shokef/9e *3w7sdf -qca pfbh u,2uy+ q6qws a ,mzqx)1m;l/-e;hbp r fadr a 0uniformly accelerating ball. The position of the ball each second is indi q;emh ;mx,a0bzl)fra/-dp r1cated.
What is the average speed of the ball between 3 and 4 seconds?
A. 3.0 cm/s
B. 3.5 cm/s
C. 4.0 cm/s
D. 7.0 cm/s
E. 12.5 cm/s
