The height of a tennis ball thrown straight up into the air can be modeled by the function

h(t) = -4.9t² + 12t + 1, where t is the time in seconds after release and h(t) is the height

of the ball in meters. Find the average rate of change in meters per second from 0.5 to 1

second.

A 8.1

B 6.93

C 5.775

D 4.65