A weapon of mass destruction (WMD) is defined as:

A weapon of mass destruction (WMD) is specifically defined as any agent that can lead to large-scale death or casualties, typically affecting civilians or military personnel. This definition encompasses not just nuclear weapons, but also chemical, biological, and radiological agents that can cause significant harm to a large number of people in a single event or attack.

WMDs stand out from conventional weapons as they have the potential to inflict damage on a massive scale, potentially impacting entire populations and environments. This categorization serves to highlight the seriousness of these weapons and the need for specific regulations and responses in emergency management and public health.

While other options mention varying forms of violence or devices, they do not capture the comprehensive and destructive capability associated with WMDs. The correct definition emphasizes the widespread impact and intent behind using such weapons, making it crucial in discussions about global security, disaster response planning, and public health preparedness.