Final answer:
Fissionable material is not a typical biological agent used in terrorist attacks, whereas toxins, viruses, and bacteria are known agents with examples like the anthrax attacks in 2001. Therefore correct option is A
Step-by-step explanation:
The item that is NOT a typical biological agent used in terrorist attacks is a. fissionable material. Biological agents commonly used in bioterrorism include toxins, viruses, and bacteria. An infamous example of bioterrorism occurred when Bacillus anthracis spores were sent in letters through the mail in 2001 during the anthrax attacks in the United States, highlighting the impact of bacteria as a biological weapon.