The answer is C: Adding information to clarify a point.
Explanation for each option:
A. Writing without worrying about grammar - This action is more characteristic of the drafting phase, where the focus is on getting ideas down on paper without concern for grammar or structure. During revision, the writer refines and reorganizes content.
B. Proofreading the text for the final time - Proofreading is typically one of the last steps in the writing process, focusing on correcting surface errors in grammar, spelling, and punctuation. It is not the primary focus of the revision process.
C. Adding information to clarify a point - This is a key activity during the revision process. Writers often revise their work to improve clarity, coherence, and depth, which may involve adding new information or examples to better explain or support their points.
D. Reviewing for minor mistakes in punctuation - Like proofreading, this action is more aligned with the editing or final proofreading stages, where the focus is on correcting minor errors rather than making substantial changes to the content.