The water tank on a farm is filled to capacity. the workers used the water for 5 hours. consider the graph below which represents the relationship between the amount of water left in the tank and the time elapsed.

which statement best interprets information provided by the graph?

a. the water in the tank was being used continuously for the entire time.
b. the water in the tank was not used for some time.
c. a constant amount of water was used for the entire time.
d. the amount of water in the tank increased for some of the time and decreased for some of the time.