What is considered a weapon of mass destruction (WMD)?

A weapon of mass destruction (WMD) is defined as any device or material that is designed to cause serious harm or damage to a large number of people, property, or the environment. This can include nuclear, biological, and chemical weapons, which are specifically intended to inflict widespread fear and destruction. The emphasis on the intent and capacity to cause significant harm differentiates WMDs from other types of weapons that may not have the same destructive capability or intention.

The other options do not meet the criteria for what constitutes a WMD. Tools enhancing military strategy can refer to various types of equipment but do not inherently cause mass destruction. Similarly, a chemical used in agriculture serves practical purposes that do not align with harmful intent on a mass scale. Recreational explosives are typically designed for entertainment or sport rather than aimed at inflicting widespread damage or injury. Thus, identifying a WMD hinges on its capability to inflict serious and widespread damage, which aligns with the concept of serious harm or damage specified in the correct choice.