Comprehensive and Detailed Explanation:
To validate whether risks identified internally reflect industry risks, the auditor should compare the organization's risk profile with peer organizations, industry standards, and external best practices. This process is known as benchmarking (A). Benchmarking helps the auditor assess if management has overlooked emerging or common industry risks.
* Trend analysis (B) evaluates changes over time within the same organization, not external comparison.
* Ratio analysis (C) focuses on financial metrics, not risk identification.
* Observation (D) provides operational insights but not industry comparisons.
Therefore, benchmarking is the correct tool, aligning with IIA guidance that encourages auditors to consider both internal and external environments in risk assessments.