Which acronym refers to threats involving harmful agents such as viruses or chemical substances?

The correct answer is associated with the acronym that stands for Nuclear, Biological, and Chemical threats. NBC encompasses harmful agents that can significantly impact military and civilian populations, inclusive of viruses, bacteria, and chemical weapons. This designation is crucial for understanding the range of threats in tactical situations, particularly in contexts where advanced training in isolation, protection, and treatment of casualties from these agents is crucial.

While other acronyms such as WMD (Weapons of Mass Destruction) and CBRN (Chemical, Biological, Radiological, and Nuclear) also relate to dangerous agents, NBC is specifically focused on the biological and chemical aspects without the additional focus on radiological threats. Thus, it directly addresses the harmful agents in question. The acronym ABC does not pertain to this scope at all, serving instead as a common phrase related to foundational knowledge or basic instructions in various contexts.