Correct Answer: A

Rationale: The freezing point of pure water at standard atmospheric pressure (1 atm) is 0°C. At this temperature, water molecules slow down enough for hydrogen bonds to form a solid lattice structure known as ice. This phase change is critical in meteorology, cryogenics, and biological systems, influencing phenomena such as snow formation and temperature regulation in living organisms. The 0°C benchmark is also a key reference in temperature scales, forming the basis of the Celsius system. Variations in pressure or impurities can slightly alter the freezing point, a principle utilized in antifreeze solutions and food preservation.

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