Final answer:
The option that is not a common opinion on the effectiveness of internal control over financial reporting is the Adverse Opinion.
Step-by-step explanation:
The option that is not a common opinion on the effectiveness of internal control over financial reporting is the Adverse Opinion. An adverse opinion is issued when the auditor determines that the financial statements are materially misstated and not in accordance with generally accepted accounting principles (GAAP). This opinion indicates a significant lack of confidence in the company's financial reporting.