Which statement is true regarding the states of water?

The correct statement is that water freezes at 0°C. This is a fundamental property of water, known as its freezing point, which is universally accepted in the metric system. At this temperature, water transitions from the liquid state to the solid state (ice) under standard atmospheric conditions.

In contrast, the other statements contain inaccuracies. Water does not freeze at 100°F; in fact, this temperature is well above its freezing point in both Celsius and Fahrenheit scales. Water can freeze below 0°F, but that fact does not contradict the freezing point definition; it simply highlights that water can remain in a solid state at temperatures lower than 0°C (32°F). Lastly, water does not remain in a liquid state at temperatures below 0°C, as it will begin to freeze, thus again demonstrating the importance of the established freezing point at 0°C. Understanding these concepts is crucial in the study of chemistry and physics as they pertain to the behavior of water in various states.