Deb recorded the number of cups of water she drank each day for 7 days. The median daily number of cups of water she drank was 6. The range of the number of cups of water she drank was 4. Which statement can be made from the given information?
A. At least one day, she drank exactly 6 cups of water.
B. The least amount of water she drank could have been 1 cup.
C. The mean daily number of cups of water she drank is greater than the median daily number of cups of water.
D. If the least amount of water she drank was 3 cups, then the greatest amount of water she drank was 9 cups.