What statement about fires in vacant buildings is accurate?

Fires in vacant buildings present significant hazards to firefighter safety due to several factors. These buildings may have structural issues like weakened floors, unstable walls, and the potential for unexpected collapses. When firefighters enter a vacant structure, they often face unknown conditions, such as the presence of hazardous materials, the unpredictability of fire behavior, and a lack of visibility due to smoke and debris. Additionally, the absence of occupants means there is no one to provide information about the building layout or fire origin, making it more difficult to assess risks and devise a safe firefighting strategy. This unpredictability and potential for rapid fire spread combined with compromised structures make these scenarios particularly dangerous for firefighters, highlighting the critical need for caution and appropriate safety measures when engaged in these operations.