The graph shows how many cups of food are in an automatic pet feeder after given numbers of days. Which statement is correct?

A.
Every3/4-day, the amount of food decreases by 1 cup.

B.
Every day, the amount of food decreases by 4/3 cups.

C.
Every 3 days, the amount of food decreases by 4 cups.

D.
Every 4 days, the amount of food decreases by 3 cups.