Comprehensive and Detailed in Depth Explanation:

Government auditors typically cannot unilaterally withdraw from an audit engagement, even in cases where fraud is identified. Public-sector audits often follow mandates from higher authorities or statutes that require the auditor to continue and report findings to oversight bodies. Additionally, fraud and abuse (including misconduct and misuse of assets) are relevant to government audits under ISSAIs, contrary to A and B. Option D is incorrect because public-sector audit objectives are often broader, encompassing compliance, performance, and integrity aspects.