What occurs during an act of biological terrorism?

A. Immunity to toxins related to repeated exposures: This may occur over time in natural environments, but it does not describe a terrorism act. B. Environmental and occupational exposure to biological toxins: This describes unintentional exposures, not terrorism. C. An intentional release of viruses, bacteria, or other toxins: This is the definition of biological terrorism- deliberate use of biological agents to cause harm. D. The intentional release of hazardous chemicals into the environment: This describes chemical terrorism, not biological terrorism.