Explanation:

- Water is unique because it expands when it freezes into ice. Most substances contract when they solidify.

- This expansion happens because the hydrogen bonds in water form a crystalline structure that's less dense than liquid water.

- Option 1: one-sixteenth - This is incorrect. Ice expands more significantly than this fraction.

- Option 2: one-ninth - This is the correct answer. Ice expands about one-ninth of its liquid volume.

- Option 3: one-tenth - This is close but slightly less than the actual expansion rate.

- Option 4: one-sixty - This is much less than the actual expansion of water when freezing.