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C is corrent because Government Auditing Standards, the "Yellow Book," includes a standard for a written report on the auditor’s understanding of the entity’s internal control and an assessment of control risk.
A is incorrect because it does not represent a supplemental reporting standard for governmental financial audits. This answer is also incorrect as all privileged and confidential information need not be reported to the senior officials of the organization that arranged for the audit.
B is incorrect because it does not represent a supplemental reporting standard for governmental financial audits. This answer is also incorrect as all such instances of abuse, fraud, mismanagement, and waste need not be disclosed.
D is incorrect because it does not represent a supplemental reporting standard for governmental financial audits. This answer is also incorrect as illegal acts may need to be reported beyond senior officials of the entity audited.