Answer :
Final answer:
Science fiction element in 'Exhalation' is the dying world premise.
Explanation:
The story element that most clearly categorizes 'Exhalation' as a work of science fiction is B. The story's premise of a dying world. Science fiction often explores futuristic and speculative concepts such as a dying world, which is a common theme in the genre. This premise sets the stage for the narrative to delve into the consequences of such a scenario and the impact on its characters.
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