Name three key components of a hazardous materials incident report.

The correct choice highlights the essential elements that must be documented in a hazardous materials incident report. A description of the incident is crucial as it provides context and details about what occurred, including any relevant circumstances leading to the event. Understanding the materials involved is fundamental for assessing the potential risks and required response measures, ensuring that responders have critical information about what they are dealing with. Additionally, documenting the actions taken during the incident is vital for evaluating the effectiveness of the response and for future planning and training purposes.

This comprehensive approach reflects best practices in incident reporting, as it maintains a focus on safety and response effectiveness. Other options, while they may include some relevant details, do not encompass the critical information necessary for understanding and addressing hazardous materials incidents fully. For instance, financial costs, employee counts, or budgets are important in broader organizational contexts but do not address the immediate safety and procedural aspects that are vital following such incidents.