A story in a building is defined as which of the following?

A story in a building is accurately defined as the space between two adjacent floors, which encompasses the total height of that area from the finished floor of one level to the finished floor of the level above. This definition aligns with the concept that a story represents the usable vertical section of a building.

While some might argue that the space between the floor and the roof is also relevant, this description lacks specificity regarding the levels within the building. It can lead to confusion between different architectural terminologies. A story is more precisely associated with the separations created by floors, whereas the space between the floor and the roof pertains to the overall volume or area defined by the building's structure.

Consequently, the combination of defining a story as both the space directly between two floors underscores the essential nature of architectural measurements and the functionality of different levels within a building, making "both A and B" the comprehensive choice.