When assessing fraud risks, internal auditors should first consider any prior fraud investigations related to the engagement. This approach helps in understanding the historical context of fraud within the organization and identifying patterns or recurring issues that need attention. Reviewing prior investigations (Option B) is a foundational step as it provides a basis for understanding past incidents and informs the assessment of current fraud risks. This is in line with the guidance provided by the IIA, which emphasizes understanding the history of fraud as a critical part of the risk assessment process.
IIA Practice Guide: Internal Auditing and Fraud
IIA Standards, Standard 1210.A2: Internal auditors must have sufficient knowledge to evaluate the risk of fraud