An astronaut in a spaceship. Hence, option B is correct.
What is an isolated system?
A system that does not interact with its surroundings.
To stay physiologically, emotionally and psychologically fit in isolation, astronauts exercise, eat healthily, follow a sleep and work schedule, and make time for leisure activities.
Hence, an astronaut in a spaceship is an isolated system.
Learn more about the isolated system here:
https://brainly.com/question/14434076
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