What is the reverse behavior of setting fires termed?

The reverse behavior of setting fires is best described as firefighting. Firefighting involves the active efforts to extinguish fires, prevent their spread, and mitigate the damage caused by fire. This action contrasts directly with the act of intentionally setting fires, such as in cases of arson. Firefighters utilize various techniques, equipment, and strategies to protect lives, property, and the environment from fire hazards.

While other options such as fire control, arson prevention, and fire safety education are relevant in the broader context of fire management and safety, they do not embody the direct opposite of starting a fire. Fire control refers to strategies to manage or limit an existing fire's severity, arson prevention aims to reduce the incidence of intentionally set fires, and fire safety education focuses on teaching individuals how to prevent fires and respond effectively if one occurs. None of these options specifically represent the direct action taken to combat and extinguish fires like firefighting does.