Water can dissolve many different substances. Water is less dense as a solid than as a liquid. Water has a Mohs hardness of about 2 when it is frozen. Water holds less air at higher temperatures.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Fish can live in lakes that are frozen because liquid water remains below the ice at the surface. Which of these describes a property of water that allows some liquid water to remain in frozen lakes?
Possibilities:
- Water can dissolve many different substances.
- Water is less dense as a solid than as a liquid.
- Water has a Mohs hardness of about 2 when it is frozen.
- Water holds less air at higher temperatures.

Water is less dense as a solid than as a liquid.