Which temperature is recognized as absolute zero?

Absolute zero is defined as the point at which all molecular motion theoretically ceases. In the context of temperature scales, it corresponds to -273.15 degrees Celsius. When rounded, this is typically represented as -273 degrees Celsius.

This temperature has significant implications in physics and thermodynamics, as it is the lowest possible temperature that can be achieved, where a system has minimum thermal energy. In this context, the other choices represent temperatures well above absolute zero. For instance, 0 degrees Celsius is the freezing point of water, -459 degrees Fahrenheit is equivalent to absolute zero, but it's not the most commonly recognized scale. Similarly, 32 degrees Fahrenheit is the freezing point of water and also well above the absolute zero mark. Hence, the designation of -273ºC as absolute zero is both standard and precise, making it the correct answer.