Final answer:
The space directly under the roof of a building, particularly a house, is called an attic. It is different from a basement, a cellar, or a loft, which have their respective locations and uses in a building's structure.
Step-by-step explanation:
The space directly under the roof of a building, especially a house, is known as an attic. This area can be used for storage or, in some cases, converted into a living space. The other options provided, such as basement, loft, and cellar, do not correctly describe this space. A basement and a cellar are both typically found below ground level in a building. A loft can refer to an upper story or a raised area in a room or a large adaptive open space that could be used for residential purposes in what formerly would have been industrial or commercial properties. However, when specifically referring to a space directly under the roof, attic is the accurate term.