An auditor is calculating materiality for a nonissuer client. The client has fluctuating net income over the past three years due to non-recurring gains and losses. Which of the following benchmarks would be MOST appropriate for determining overall materiality?

When a company has volatile earnings (fluctuating net income), net income is not a stable benchmark. Auditors typically switch to more stable benchmarks such as Total Revenues or Total Assets to ensure materiality doesn't fluctuate wildly from year to year, or they might use normalized earnings (excluding non-recurring items). Option B is the best standard alternative.