Which of the following best represents the type of materials involved in a deflagration hazard?

Deflagration is a rapid combustion process that occurs at subsonic speeds, typically resulting in a relatively low explosion compared to detonation. This type of hazard is primarily associated with the presence of combustible materials. These materials can ignite and burn in an oxygen-rich environment, leading to the quick release of energy that characterizes deflagration.

In the context of deflagration hazards, combustible materials include a variety of substances such as wood, paper, textiles, and certain plastics, all of which are capable of burning violently under the right conditions. Understanding the nature of these materials and their behavior during combustion is essential for fire safety and risk assessment.

While metals and composites may present fire hazards under certain conditions, they do not typically fit within the classic definition of combustible materials. Glass, on the other hand, is generally not considered a combustible because it does not burn, making it irrelevant to deflagration hazards. Thus, the classification of combustible materials is key in identifying the potential for deflagration, solidifying the selection as the most accurate representation of materials involved in this hazard.