Which scenario might lead to an undetermined fire cause classification because investigators cannot identify the ignition sequence?

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The main idea here is that fire cause classification depends on identifying the ignition source and the sequence of events that led to the fire. If investigators cannot pin down the ignition sequence, they can’t reliably classify the cause, so the determination becomes undetermined.

This scenario fits because when a structure is destroyed, essential evidence about where the fire started and how it spread is often lost or obscured. Without that evidence, there’s no solid basis to conclude whether the ignition was accidental, natural, or incendiary, so investigators must label the cause as undetermined.

In the other situations, there’s at least some evidence or a pathway to a conclusion. Suspicion without proof doesn’t provide a clear ignition sequence to anchor a specific cause, and clear evidence of an ignition sequence points to a definite determination rather than an undetermined one.