The answer is D. Wall.
A beam, pillar, and house are all vertical structures that support weight. A wall, on the other hand, is a horizontal structure that separates two spaces.
A beam is a horizontal structural element that is used to support weight. It is typically made of wood, steel, or concrete, and it is often used in conjunction with other structural elements, such as columns and joists.
A pillar is a vertical structural element that is used to support weight. It is typically made of stone, brick, or concrete, and it is often used in conjunction with other structural elements, such as arches and vaults.
A house is a building that is used for human habitation. It is typically made of wood, brick, or concrete, and it consists of a number of rooms, including a kitchen, a living room, and bedrooms.
A wall is a vertical structure that is used to separate two spaces. It is typically made of wood, brick, or concrete, and it can be either load-bearing or non-load-bearing.