Concept:Water expands when it changes from liquid to solid ice.
Explanation:During very cold weather, water inside pipes loses heat and freezes.
Unlike most liquids, water expands as it freezes.
This expansion creates a large outward force on the walls of the pipe.
The pipe cannot easily stretch to accommodate the growing ice.
As a result, the pressure inside the pipe becomes very high.
Eventually, this pressure causes the pipe to burst.
So the bursting is directly due to expansion of water on freezing.
Answer:B. expansion of water on freezing.