In which of the following circumstances may the auditor issue the standard unqualified, unmodified audit report? A. The client disclosed a change in accounting principles with an immaterial effect on financial position and results of operations. B. The financial statements do not disclose significant going concern issues. C. The financial statements do not disclose a justified departure from generally accepted accounting principles. D. The auditor has not been able to audit a substantial portion of the balance sheet because of circumstances beyond anyone's control.