Final answer:
The answer is C. Firm policy sets materiality at 4% of pretax income.
Step-by-step explanation:
The correct answer is C. Firm policy sets materiality at 4% of pretax income.
Materiality is a concept used by auditors to determine the significance of an error or omission in financial statements. It helps auditors decide what level of misstatement or omission would affect a user's decision-making. In this case, the materiality is already predetermined by the firm's policy and is not a qualitative factor considered by the auditor.
Qualitative factors that may affect an auditor's establishment of materiality include potential for fraud, violation of loan covenants, and interruption of earnings trend.