What Is True of Risk Factors,in the Context of Epidemiological

What is true of risk factors,in the context of epidemiological studies?

A) If a person possesses a risk factor, it's certain that he or she will develop the disease or disorder at some point.
B) Identification of risk factors can be useful to target people for assessment and treatment.
C) Both of the above are true.
D) Neither of the above is true.