Final answer:
Mandy owns the airspace within her condominium unit and a share in the common elements of the condominium complex. She does not own the entire building or the land beneath the building.
Step-by-step explanation:
When Mandy recently bought a condominium unit, what she actually owns is D) the airspace within the unit. This means she has ownership of the interior space of her specific unit, as defined by the legal boundaries set forth in the condominium declaration. However, Mandy also usually owns a B) share in the common elements of the condominium, such as the swimming pool, gym, hallways, and other facilities that are used by all residents. She does not own A) the entire building or C) the land beneath the building; these are generally considered common elements and are owned collectively by all unit owners.