Answer: is unable to issue an opinion.

**Explanation:** - **Option A** is correct because a disclaimer of opinion occurs when auditors are unable to obtain sufficient appropriate audit evidence to form an opinion on the financial statements. This typically arises due to significant limitations on the scope of the audit. - **Option B** is incorrect because a qualified opinion, not a disclaimer of opinion, is issued when the auditor encounters a situation where there is a scope limitation or an exception to accounting standards that is not pervasive. - **Option C** is incorrect because an adverse opinion is issued when the auditor concludes that the financial statements materially depart from accounting standards and are not presented fairly, which is distinct from a disclaimer of opinion.

Author: LeetQuiz Editorial Team