Hazard of contents is based on danger of:

The correct answer encompasses a comprehensive view of the hazards associated with the contents of a building, which include multiple critical factors. The risk of fire is not only about its initiation and propagation but also involves other significant dangers that arise during a fire scenario.

Primarily, the start and spread of fire are fundamental aspects of fire behavior. However, the threat extends further due to the smoke and gases produced when materials burn. These byproducts can be hazardous to health, causing inhalation injuries or exacerbating conditions like respiratory illnesses. Furthermore, smoke can obscure visibility, complicating evacuation efforts and the work of first responders.

Additionally, some materials can be prone to explosions when exposed to heat, flames, or certain conditions that characterize a fire. These explosions can result from rapid chemical reactions, particularly in environments containing flammable substances or certain types of batteries.

Thus, recognizing that the hazard of contents includes all these factors—initiation and spread of fire, the toxic or harmful smoke and gases generated, and the potential for explosions—provides a thorough understanding of the risks present in a specific environment. Therefore, this comprehensive consideration makes the response appropriate in assessing the hazards effectively.