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The correct statement is: Every 4 days, the amount of food decreases by 3 cups.
This can be observed from the points on the graph. From (0, 8) to (4, 5), there is a decrease of 3 cups over a period of 4 days. Similarly, from (4, 5) to (8, 2), there is another decrease of 3 cups over a period of 4 days. Therefore, the amount of food decreases by 3 cups every 4 days.