Which of the Following Items Would Best Be Characterized as a "Fixture

Which of the following items would best be characterized as a "fixture?"

A) A tractor owned by a farmer and stored in her barn.
B) A barn constructed on the land after the land was initially purchased by the farmer.
C) A camper that was originally used for cross-country travel, but which is now permanently attached to a cement foundation on the farmer's land.
D) The free-standing appliances in the farmer's kitchen, such as the refrigerator.
E) The intangible elements connected with and owned by the farmer, such as the value of her equipment and the equity in the property.