Final answer:
0°C, 273.15 K, and 32°F all represent the freezing point of water and thus are equivalent temperatures. None of the options is colder than the others.
Step-by-step explanation:
To determine which temperature is the coldest between 273.15 K, 0°C, and 32°F, it is important to understand the relationship between the different temperature scales. The freezing point of water is defined as 0°C and is equivalent to 273.15 K. When it comes to the Fahrenheit scale, the freezing point of water is 32°F. Since the scales are designed so that the freezing points of water are equivalent, all three measurements represent the same temperature. Therefore, none of these options is colder than the others.