Which Statement BEST Describes an Effect of the Low Density

Which statement BEST describes an effect of the low density of frozen water in a lake?

A) When water freezes, it contracts, decreasing the water level in the lake.
B) Water in a lake freezes from the bottom up, killing most aquatic organisms.
C) When water in a lake freezes, it floats, providing insulation for organisms below the ice.
D) Water removes thermal energy from the land around a lake, causing the lake to freeze.