Final answer:
D) Fixture
The custom-made bookcase in the living room of a house is typically considered a fixture, as it is intended to be a permanent part of the property unless an agreement specifies otherwise.
Step-by-step explanation:
The custom-made bookcase that specifically fits into the living room of the house being sold is most likely considered a fixture. A fixture is a piece of personal property that has been attached to real property (like a house or land) in such a way that it becomes part of that real property. In real estate transactions, unless there is an agreement stating otherwise, fixtures are typically included in the sale of the property because they are seen as permanently attached to and part of the property itself. In this case, since the bookcase was custom-made to fit into the oddly shaped room, it is likely intended to be a permanent part of the home which makes it a fixture.