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Comprehensive and Detailed Explanation:

The correct answer is C.

A root cause is the fundamental underlying reason an incident occurred. It is not the immediate event or symptom, but the deeper system failure, such as poor training, inadequate procedures, equipment design flaws, or weak supervision.

Incident investigations often distinguish between direct causes (what happened immediately), contributing factors (conditions that influenced the event), and root causes (system-levelbreakdowns). Identifying only surface-level causes can lead to ineffective corrective actions that fail to prevent recurrence.

OHST professionals are trained to conduct structured investigations using tools such as the “5 Whys,” fault tree analysis, or cause-and-effect diagrams. The goal is to prevent future incidents by addressing systemic issues rather than blaming individuals.

Effective root cause analysis leads to stronger safety systems, improved procedures, and long-term risk reduction.