Final answer:
An example of editing a written document is proofreading for grammar errors, which is option (b).
Step-by-step explanation:
Editing a written document involves making changes at the sentence level, such as adjusting phrasing, correcting grammar, ensuring proper mechanics, and refining wording. An example of editing would be proofreading for grammar errors, which is choice (b) from the provided options. When editing, it is essential to read your paper aloud or use a device's reading feature to identify areas that might not sound right, indicating a need for editing. Additionally, paying attention to electronic underlining, such as blue for grammar suggestions or red for spelling mistakes, can be helpful during the editing process. It is also recommended to review the entire piece after individual sentence examination to ensure overall flow and coherence.