Final answer:
The CPA should first notify the board of directors about management's refusal to adjust the financial statements. If the board does not act appropriately, the CPA should then inform parties relying on the financial statements that they should no longer be relied upon. So the correct answer is option 2.
Step-by-step explanation:
When a CPA discovers that there has been a material subsequent event after the issuance of an unqualified audit report, and management refuses to adjust the financial statements, the CPA should take appropriate action to ensure that the financial statements are not misleading.
The correct course of action in this scenario is closest to option 1. The CPA has an obligation to ensure that the financial statements and related audit report are not relied upon if they are materially misstated. Although the CPA cannot issue revised financial statements on behalf of the entity (options 3 and 4), they should notify the board of directors about the situation.
If the board does not take appropriate action to prevent reliance on the financial statements, the CPA should notify parties that are currently relying on the financial statements and the related auditor's report.