Final answer:
The option that prevents further changes on a Task Sheet is 'Lock Task Sheet.' It ensures the integrity of the tasks recorded by preventing editing, while navigation through changes is possible using the Previous and Next buttons. So the correct answer is Option 3.
Step-by-step explanation:
When managing Task Sheets, the option that prevents further changes on the selected sheet is Lock Task Sheet. Once a Task Sheet is locked, it cannot be edited or modified, ensuring that the data remains consistent and unchanged. This can be helpful in environments where multiple people may be working on the same project, and it's essential to preserve the integrity of the tasks recorded. To review changes without altering the locked content, you can utilize features like clicking the Previous and Next buttons beside the Accept and Reject options, allowing you to navigate consecutively through changes in the tools ribbon.