The table below shows the distance d(t) in meters that an object travels in t seconds: t (seconds): 1, 2, 3, 4 d(t)(meters): 15, 60, 135, 240 what is the average rate of change of d(t) between 2 seconds and 4 seconds, and what does it represent? a. 50 m/s; it represents the average speed of the object between 2 seconds and 4 seconds b. 90 m/s; it represents the average speed of the object between 2 seconds and 4 seconds c. 90 m/s; it represents the average distance traveled by the object between 2 seconds and 4 seconds d. 50 m/s; it represents the average distance traveled by the object between 2 seconds and 6 seconds