Sarah operates a small ice cream shop in a popular resort town. She sells several flavors of ice cream and three flavors of frozen yogurt. Her total cost function per day is C(I, Y) = 27 + 0.05I² + 0.025Y³, where I is ice cream and Y is yogurt. Sarah is a price taker in the very competitive market for cold treats in this town. The price of ice cream is $5.50 and the price of frozen yogurt is $4.75. What level of daily ice cream sales would maximizes profits?

A. 25

B. 35

C. 45

D. 55