Which hypothesis best explains why, relative to their sizes, a rabbit must eat a greater volume of food than a hippopotamus?
A. Rabbits run faster than hippopotamuses.
B. Rabbits lose heat more easily due to their relatively larger surface area.
C. Rabbits are prey, and therefore require more stored energy.
D. Hippopotamuses inhabit only hot climates.
E. Hippopotamuses spend significant amounts of time in water.