SPOT THE ERROR:The happy girl cheerfully greeted her pretty friends and gratefully guests.

Explanation

Analysis: The word "gratefully" is incorrectly used. The structure "gratefully guests" is grammatically incorrect. The correct phrasing should be "grateful guests" if the guests are being described as grateful, or "and the guests gratefully" if it describes how the guests were greeted.Conclusion: This option contains the error.Gratefully: This option is the correct one to mark, as "gratefully" is incorrectly used.Explanation:"Happy" is correctly used to describe the girl."Cheerfully" is correctly used to describe how the girl greeted her friends and guests."Pretty" is correctly used to describe her friends."Gratefully" is incorrect; it should either be "grateful guests" or the structure should be adjusted to "and the guests gratefully."So, the correct answer is D) Gratefully.