Which of the following fuels is classified as Jet A or A1?

Jet A and Jet A1 are specific types of aviation fuels that fall under the classification defined by the ASTM (American Society for Testing and Materials) standards. These fuels are kerosene-based and are primarily used in commercial aviation for jet engines.

The ASTM specification establishes the quality and performance characteristics necessary for these fuels, including properties like freezing point, flash point, and thermal stability. Jet A is predominantly used in the United States, while Jet A1 is an internationally recognized variant that has a lower freezing point, making it suitable for use in colder environments.

In the context of aviation fuels, the other options refer to different types of fuels: JP8 is a military specification for aviation fuel, QAV1 may refer to a specific fuel used in certain countries but not classified as Jet A/A1, and Jet B is a different type of aviation fuel intended for special conditions, primarily used in extreme cold but is not classified under Jet A or A1 standards. Therefore, the option related to ASTM is the correct classification for Jet A and A1 fuels.