Since the premise contains the information that spacecraft will be used by astronauts and their stay will provide knowledge about medical limitations of human beings, it is given that their health matches more or less than any ordinary citizen.
Negating A will cause the argument to fall apart since it is assumed that study will provide essential information about humans. A is an assumption on which that conclusion rests, since it assumes that all of the astro will be humans.
Negating A will cause the argument to fall apart since it is assumed that study will provide essential information about humans. A is an assumption on which that conclusion rests, since it assumes that all of the astro will be humans.
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