Final answer:
The correct answer is D. lumber. Lumber is not considered realty because it is a manufactured product and not a natural resource or land.
Step-by-step explanation:
The correct answer is D. lumber. Lumber is not considered realty because it is a manufactured product and not a natural resource or land. Realty refers to immovable property, such as land, buildings, and structures. While a growing tree, land, and bricks mortared together in a wall are all examples of realty, lumber is not included in this category.