John is standing on a set of bleachers and throws a baseball into the air. the baseball lands on a field. the height of the ball, in meters, is modeled by the function shown in the graph. what’s the average rate of change of the height from the point when john throws it to its maximum height

a.) -2 meters per second
b.) 2 meters per second
c.) -1/2 meters per second
d.) 1/2 meters per second