Here's a problem to solve: Which fact about water is an example of a chemical property?

Among the 4 following options, which is the correct answer?

- A: Water expands when it freezes.
 
- B: The boiling point of water is 100ºC.
 
- C: Water can separate into hydrogen and oxygen.
 
- D: The density of water is greater than the density of ice.
 