Hello there, i was wondering if someone can me out on this.

the graph shows the total amount of gravel delivered to a construction site at different months after the construction project began.

which statements are true?
choose all answers that are correct.

a) the average rate of change between month 3 and month 5 is about twice the average rate of change between month 6 and month 9.

b) the average rate of change between month 3 and month 5 is about three times the average rate of change between month 6 and month 9.

c) the average rate of change between month 1 and month 3 is about one-third the average rate of change between month 5 and month 6.

d) the average rate of change between month 1 and month 3 is about one-half the average rate of change between month 5 and month 6.