Which of the following are recognized as causes of wildland fires?

Wildland fires can be caused by a variety of factors, and recognizing these helps in understanding how to prevent and manage such incidents effectively. The correct answer identifies natural, accidental, and intentional causes.

Natural causes refer to events such as lightning strikes or volcanic eruptions that can ignite fires without any human intervention. Accidental causes encompass activities like campfires left unattended, discarded cigarettes, and machinery malfunctions that can unintentionally lead to a wildfire. Intentional causes include arson, where individuals deliberately set fires.

The other options present various categories that do not accurately reflect the primary causes of wildfires. Preventive, reported, and structural refers more to measures and means of dealing with fires rather than causes. Chemical, mechanical, and biological do not represent the categories typically used to describe wildland fire causes. Similarly, controlled, spontaneous, and deliberate also do not align with the primary causes of wildfires in the context of natural environments, as the word "controlled" generally relates to managed burns rather than causes of wildfires.