Which of the following can indicate a potential incendiary fire?

An unusual fuel load or configuration can indeed be a strong indicator of a potential incendiary fire. In fire investigations, the presence of atypical arrangements or unexpected combinations of materials can suggest that the fire was intentionally set. For instance, if fuel materials are piled in a specific way that is not natural or typical, it raises concerns that someone may have deliberately arranged them to facilitate ignition and spread.

Additionally, certain configurations might lead to faster burn rates or increased flames that go beyond what would be expected from an accidental fire. This aspect makes option B particularly relevant in differentiating between accidental and incendiary fires, as it can point towards intentional manipulation of the environment to create a fire hazard.

The other options, while they can play a role in understanding fire dynamics or patterns, do not inherently suggest the fire's intentionality as strongly as unusual fuel loads do. For example, consistent ignition sources indicate a pattern but do not alone imply malicious intent. Likewise, fires without burn injuries may occur in various circumstances and are not definitive in indicating incendiary causes, and low environmental conditions, while they influence fire behavior, are not a direct indicator of intentional activity.