Pick up the correct statement from the following: A. The cost of square rooms is less B. The expenditure on the foundation and roof for the double storeyed building is nearly half of that for the ground storeyed building C. The cost of construction of a house may be minimized by restricting the height floors D. All the above

The correct answer is D. All of the above.

The cost of square rooms is less because they require less material to build. The expenditure on the foundation and roof for the double storeyed building is nearly half of that for the ground storeyed building because the foundation and roof of a double storeyed building are shared by two floors. The cost of construction of a house may be minimized by restricting the height floors because the higher the floor, the more material is required to build it.

Here are some additional details about each option:

• The cost of square rooms is less because they require less material to build. A square room has four walls of equal length, while a rectangular room has two long walls and two short walls. The longer the walls, the more material is required to build them. Therefore, a square room will always require less material to build than a rectangular room of the same size.
• The expenditure on the foundation and roof for the double storeyed building is nearly half of that for the ground storeyed building because the foundation and roof of a double storeyed building are shared by two floors. The foundation is the part of the building that supports the weight of the structure. The roof is the part of the building that protects the interior from the elements. The foundation and roof of a double storeyed building are larger than the foundation and roof of a ground storeyed building, but they are shared by two floors. This means that the cost of the foundation and roof per floor is lower for a double storeyed building than for a ground storeyed building.
• The cost of construction of a house may be minimized by restricting the height floors because the higher the floor, the more material is required to build it. The higher the floor, the more material is required to build the walls, the roof, and the stairs. The higher the floor, the more weight the foundation must support. Therefore, the cost of construction of a house may be minimized by restricting the height floors.