Which is NOT a fire cause classification?

• A. Natural
• B. Undetermined
• C. Incendiary
• D. Unintentional

Answer: (D)

Understanding fire cause classifications helps investigators organize why a fire started. The standard categories you’ll see are natural, incendiary, accidental, and undetermined. Natural covers events from weather or environmental factors. Incendiary means the fire was started on purpose or with an intentional ignition source. Undetermined is used when there isn’t enough evidence to decide a cause. Accidental is the term used for an unplanned, unintentional ignition.

The option that uses “unintentional” isn’t a separate, formal category in typical fire investigation nomenclature. Instead, unintentional ignition is captured under the accidental category. Because “unintentional” isn’t a named, stand-alone classification, it isn’t considered a distinct fire cause classification. The other choices—natural, incendiary, and undetermined—are valid, recognized classifications.