The primary reason for audit supervision to include the approval of the engagement report is to ensure that the findings and conclusions presented in the report are substantiated by adequate and appropriate evidence. This is critical for maintaining the credibility and reliability of the audit function.

IIA Standard 2340 – Engagement Supervision:

This standard requires that engagements be properly supervised to ensure that objectives are achieved, audit work is performed according to appropriate standards, and that the results are supported by sufficient, reliable, and relevant evidence.

Substantiation of Findings:

Approval of the engagement report by the supervisor ensures that the findings and conclusions are not only accurate but also supported by documented evidence. This substantiation is essential for the report to be credible and for the audit to fulfill its purpose.

IIA Practice Advisory 2340-1:

The advisory emphasizes the role of supervisors in reviewing and approving the engagement report to ensure that all findings are well-founded and appropriately supported by the audit evidence.

Option A (Ensure objectives are met): While meeting objectives is important, the primary focus of report approval is to ensure that the findings are substantiated.

Option B (Ensure senior management support): Support from management is necessary, but it should be based on a report that is well-supported by evidence.

Option C (Ensure style and grammar): Style and grammar are secondary considerations; the primary focus should be on the accuracy and substantiation of findings.

Detailed Explanation:Why Not Other Options?Conclusion: Option D is correct because the primary reason for the supervisor’s approval of the engagement report is to ensure that the findings are substantiated by evidence, ensuring the credibility and reliability of the audit report, in line with IIA standards.