Choice "C" is correct. The failure of the financial statements to contain adequate disclosure of related party transactions, or other required disclosures, would result in a qualified or adverse opinion, not a disclaimer of opinion.
Choice "b" is incorrect. A client's refusal to permit its attorney to furnish information requested in a letter of audit inquiry would generally result in a disclaimer of opinion.
Choice "d" is incorrect. The auditor's inability to observe physical inventories or apply alternative procedures to verify their balances could result in a disclaimer.
Choice "a" is incorrect. The auditor's inability to determine the amounts associated with illegal acts committed by the client's management could result in a disclaimer.
