What type of sample involves collecting air, water, soil, bulk, surface, and other materials?

The correct choice is “media” because it refers specifically to the various substances or materials through which contaminants can be detected. In a CBRN reconnaissance context, media encompasses air, water, soil, and any additional environmental materials that are collected for analysis. This terminology is often used because it aligns with the scientific approach of gathering samples from different sources to assess the presence and concentration of chemical, biological, radiological, or nuclear agents.

In this situation, air samples might be taken to analyze airborne contaminants; water samples can help identify chemical pollutants or biological threats in a water source; soil samples are essential for detecting land-based contaminants; and bulk or surface samples refer to more localized materials that could harbor specific hazards. Each type of media plays a crucial role in a comprehensive evaluation of the environmental impact of CBRN incidents.

The other options do not capture the focus on diverse environmental samples as effectively. "Composite" typically refers to a sample that is a mixture or combination from various sources, which may not encompass all individual sample types. "Sample set" implies a collection but lacks the specificity of the types of media involved. "Sample collection" is a broader term referring to the act of gathering samples without specifying the types of materials being collected. Thus,