Which Observation Makes a Strong Case That the Study of Water

Which observation makes a strong case that the study of water and its properties is relevant to the study of structural biology?

A) Corals are marine animals that live in close association with photosynthetic algae that supply the corals with a source of food.
B) Some Arctic fish produce antifreeze proteins to prevent ice crystals from forming in their cells.
C) Animals that live in caves their entire lives rely on nutrients brought into their habitats by running water or by other organisms.
D) Ice loses mass as water molecules go from the solid state directly to the gas state.
E) Lake ecosystems can be destroyed by chemical fertilizers carried from farmland into lakes in rain runoff.