How is the term "likelihood" related to the concept of "threat?

In Risk Management, how is the term "likelihood" related to the concept of "threat?"
A. Likelihood is the probability that a threat-source will exploit a vulnerability.
B. Likelihood is a possible threat-source that may exploit a vulnerability.
C. Likelihood is the likely source of a threat that could exploit a vulnerability.
D. Likelihood is the probability that a vulnerability is a threat-source.

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