Barnes, a Certified Fraud Examiner (CFE).

The Fraud Examiners Manual lists specific queries for accounts payable analysis, including:

“Review recurring monthly expenses and compare to posted/paid invoices.”.

While comparing book vs. tax depreciation applies to asset management (not A/P), and identifying paycheck anomalies applies to payroll (not A/P), the most effective A/P-specific test is the recurring expense comparison. Hence, C is correct.