Under the Fair Housing Act, individuals with disabilities are permitted to make reasonable modifications to their rental unit at their own expense if the changes are necessary to afford them full enjoyment of the premises. The landlord or property manager must allow these modifications unless the property is government-subsidized housing, where the owner may be required to pay. Requiring medical proof or charging extra deposits beyond the cost of restoring the property (if applicable) is not allowed. Therefore, the correct answer is A.

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