The table below shows the number of cups of food Trey's cat ate over time.
Number of cups: 3, 4, 9, 12, 15
number of days: 4, 8, 12, 16, 20
Which statement gives a unit rate?
A: For every day, Trey's cat ate 1.5 cups
B: For every cup, Trey's cat ate for 1.5 days
C: For every cup, Trey's cat ate for 0.75 of a day
D: For every day, Trey's cat ate 0.75 of a cup