What is the first step a first responder should take upon identifying a hazardous material?

Answer: B — Ensure personal safety and assess the situation

The first step a first responder should take upon identifying a hazardous material is to ensure personal safety and assess the situation. This is a critical action because the safety of the responder and any nearby individuals is paramount in any emergency involving hazardous materials. By ensuring personal safety first, the responder can evaluate the scene without putting themselves at unnecessary risk. Assessing the situation includes identifying the type of hazardous material, its potential risks, and the impact it may have on the surrounding environment and people. This comprehensive assessment informs the responder's subsequent actions, such as whether evacuation is necessary, if backup is needed, or if containment efforts should be started. Taking this cautious approach helps to avoid exacerbating the situation and allows for an informed response strategy based on the conditions present. Other options such as calling for emergency backup, evacuating the area, or containing the material are important steps, but they should come only after ensuring that it is safe to proceed and understanding the specific context of the incident.