Correct Answer: C

Rationale: At sea level, water boils at 100°C (212°F) under standard atmospheric pressure (1 atmosphere or 101.3 kPa). Boiling occurs when the vapor pressure of water equals the surrounding air pressure, allowing bubbles of vapor to form within the liquid. However, this temperature can vary with altitude — it decreases as elevation increases because atmospheric pressure drops. Understanding this principle is fundamental in physics and chemistry, as it influences cooking times, distillation processes, and various industrial applications involving heat and phase changes.

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