Which gases have approached the temperatures of absolute zero?

The correct answer highlights that some cryogenic gases can approach temperatures near absolute zero. Cryogenic gases, such as helium and nitrogen, are specifically utilized for their properties at extremely low temperatures, enabling them to achieve states quite close to absolute zero, which is approximately -273.15 degrees Celsius.

These gases possess unique behaviors when cooled. For example, helium remains in a liquid state even at temperatures close to absolute zero, demonstrating superfluidity under such conditions. This distinctive property differentiates cryogenic gases from other types of gases, as most gases do not reach such low temperatures without specialized equipment and conditions.

In contrast, while all gases can theoretically be cooled toward absolute zero, practically only those identified as cryogenic gases are capable of reaching such extreme states due to their physical and chemical properties. The other options suggest broader categories that do not specifically pertain to the unique behavior of cryogenic gases at these extreme temperatures.