Final answer:
The correct answer to the question is Option 3: Floor. It is a horizontal surface that supports the occupants and furniture, and separates levels within a building. Along with walls, it is fundamental in a building's structure.
Step-by-step explanation:
The student has asked to identify a continuous supporting surface extending horizontally throughout a building, constituting one level in the structure. The correct option is Option 3: Floor. A floor provides a stable and level surface that separates different levels in a building. It supports the furniture, equipment, and the building's occupants. It is an essential component in construction, where the building process starts from the bottom with the foundation and continues systematically to the upper levels. The walls function along with floors to create enclosed spaces, such as rooms, and are responsible for supporting the roof and upper levels of structures.
The interconnected nature of floors, walls, and columns is critical to ensuring the overall stability and functionality of the building's architecture.