Final answer:
A) Risk assessment is the process of identifying viable threats and likelihood of occurrence.
Step-by-step explanation:
The term that best describes the process of identifying viable threats and likelihood of occurrence is risk assessment. Risk assessment involves evaluating potential hazards and determining the likelihood of those hazards occurring and the impacts they may have. It is used to inform decision-making and develop strategies to mitigate or manage risks. For example, in the context of preventing plant invasions, risk assessment techniques can be used to screen new plant introductions and assess the potential for environmental damage.