The speed of a wagon increases from 2.5 meters per second to 9.0 meters per second in 3.0 seconds as it accelerates uniformly down a hill. What is the magnitude of the acceleration of the wagon during this 3.0-second interval?

A) 0.83m/s2

B) 3.0m/s2

C) 3.8m/s2

D) 2.2m/s2