How is biological warfare defined?

Biological warfare is defined as the intentional use of germs, viruses, or toxins to harm or incapacitate individuals or populations. This definition directly reflects the concept of utilizing living organisms or organic substances as weapons to inflict disease or death. The focus on intention distinguishes biological warfare from other forms of harmful actions, as the deliberate aspect is crucial to categorizing such acts as warfare.

In contrast, the other choices highlight different forms of aggression or harmful actions that do not fit the definition of biological warfare. For example, the first option pertains to the use of chemical agents rather than biological agents, while the third discusses the spread of diseases in a general context, which lacks the deliberate intent associated with warfare. The last option, concerning nuclear agents, pertains to a completely different category of warfare altogether. Thus, option B accurately encapsulates the essence of biological warfare, emphasizing both the intention and the biological agents used.