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B is corrent. Trees that are growing on land are considered real property and a part of the land. When they are cut down, they are no longer part of that real property and thus become personal property. A house built on land becomes part of the real property of that land. This includes the materials used to build that house such as lumber.
A is incorrect. Trees that are growing on land are considered real property and a part of the land. When they are cut down, they are no longer part of that real property and thus become personal property. A house built on land becomes part of the real property of that land. This includes the materials used to build that house such as lumber. 
A is incorrect. Trees that are growing on land are considered real property and a part of the land. When they are cut down, they are no longer part of that real property and thus become personal property. A house built on land becomes part of the real property of that land. This includes the materials used to build that house such as lumber. 
D is incorrect. Trees that are growing on land are considered real property and a part of the land. When they are cut down, they are no longer part of that real property and thus become personal property. A house built on land becomes part of the real property of that land. This includes the materials used to build that house such as lumber.