Question: The diagram shows a uniformly accelerating ball. The position of the ball each second is indicated.What is the average speed of the ball between 3 and 4 seconds? A) 3.0 cm/s  B) 7.0 cm/s  C) 3.5 cm/s  D) 12.5 cm/s. Please choose an answer from [A, B, C, D].
Answer: B