A problem is the cause, or potential cause, of one or more incidents, which makes option B correct. ITIL clearly distinguishes problem management from incident management. Incident management focuses on restoring service quickly after an interruption or degradation. Problem management looks more deeply at why incidents happened and how similar incidents can be prevented in the future. This is why the root cause idea is central to the definition of a problem. An unplanned interruption is an incident, not a problem. A user request is a service request. A critical incident is still an incident, even if its impact is high. By separating incidents from problems, ITIL enables organizations to both restore service rapidly and reduce repeat disruption through analysis, learning, and long-term corrective actions.