The category of "Hard of Hearing" typically includes individuals who have some degree of hearing loss but still have some functional hearing ability.
Based on the descriptions provided:
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Sarah, who has mild hearing loss and communicates through both sign language and spoken language - Sarah fits into the "Hard of Hearing" category because she has mild hearing loss and retains some hearing ability.
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Dwight, who lost all of his hearing at 59 - Dwight would not be considered "Hard of Hearing" since he is completely deaf.
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Amy, who does not have diagnosed hearing loss but chooses to attend a school for the Deaf in order to learn ASL - Amy would not be classified as "Hard of Hearing," as she does not have hearing loss.
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Michael, who was born deaf but miraculously regained full hearing capacity after getting into a car accident - Michael would not be considered "Hard of Hearing" because he now has full hearing capacity.
Therefore, the only person who falls into the category of "Hard of Hearing" is Sarah.