"Exhalation" is classified under science fiction genre. It was created by Ted Chiang and was first made public in 2008. It has also won the famous “Hugo Award” in the year 2009.
The story is presented as a scientific journal. It deals with a scientist who is a part of a unique civilization of mechanical creatures. The writer illustrates their survival through adaptable lungs that function through the compressed air from the underground. The theme also revolves around some fictional ideas such as malfunctioning of the clocks in accordance with the brains of the beings. There are few more assets in the story that help scholars to categorize the tale into science fiction, such as dissection of brain and the possibility of other civilizations in the universe.
Moreover, it is easier to say that from the choices provided, the story's mechanical characters support the theory that it is a work of science-fiction.
Answer: B. It's mechanical characters
