正解:D
One of the possible reasons for the failure to identify transactions between the parent organization and a subsidiary is that the auditor did not have sufficient knowledge of the group structure, the consolidation process, and the related party disclosure requirements2. The auditor should obtain an understanding of the entity and its environment, including its internal control, as part of the risk assessment procedures3. This would help the auditor to identify and assess the risks of material misstatement due to related party transactions, and design and perform appropriate audit procedures to address those risks4.
References:
1: IAS 24 - Related Party Disclosures5, p. 1 2: Group audit issues | P7 Advanced Audit and Assurance | ACCA ...2, p. 1 3: INTERNATIONAL STANDARD ON AUDITING 315 (REVISED) IDENTIFYING AND ... - IFAC1, p. 1 4: ISA 550 Related Parties - IAASB, p. 1