Answer:
Option (D) Relevant ethical requirements
Explanation:
The reason is that CPA tries to keep its members to comply with the ethical requirements which CPA desires that the chartered accountants must comply with. Most firms offer both non audit and audit services to their clients. This leads to self review, familiarity, intimidation of declining the offer by the firm and self interest threats. All these threats can not make the audit report reliable as the auditor's view becomes biased. So CPA requires them to comply with the ethical requirement by enforcement.
