What is defined as a combustible assembly?

A combustible assembly refers to a configuration or construction made from materials that can ignite and sustain combustion. When one or more combustible materials are used in the assembly of a structure, it is classified as a combustible assembly because these materials can easily catch fire under the right conditions.

In the context of building codes and safety regulations, distinguishing between combustible and non-combustible materials is crucial for fire safety standards. Options describing structures made of steel, non-combustible support structures, or those made entirely of glass do not fit the definition of a combustible assembly, as steel is a non-combustible material, and glass, while having unique fire behavior, is generally not considered combustible.

Therefore, the definition aligns accurately with option B, emphasizing the presence of combustible materials within the assembly, which significantly influences fire safety and building code compliance.