The Biological Significance of Water Being Its Densest at 4°C

The biological significance of water being its densest at 4°C is that

A) bodies of water do not freeze solid.
B) floating ice allows for a solid surface in open water.
C) ice functions as a protective barrier in ponds and lakes.
D) organisms are best adapted to 4°C.
E) oceans are never colder than 4°C.