A charge nurse is teaching new staff members about factors that increase a client's risk to become violent. Which of the following risk factors should the nurse include as the best predictor of future violence?

A. While male gender is associated with a higher likelihood of violence, it is not the best predictor. B. A history of being in prison suggests past criminal behavior but does not necessarily indicate violence. C. A history of violent behavior is the strongest predictor of future violence. D. Delusions may contribute to violent behavior, but not all individuals with delusions act violently.