A sealed rectangular container 4 cm by 8 cm by 16 cm is sitting on its smallest face. In this position the water level is 4 cm from the top.
 How many centimeters from the bottom will the water level reach if the container is turned and placed on its largest face?
 A. 3
 B. 3.5
 C. 4
 D. 4.5
 E. 5.5