If you are a Learning Author, Learning Manager, Learning Administrator or Company Administrator, you may need to edit the answer or verbiage of a question in a course that students have already completed.
If any edits are made to a Question Slide in a course, this will not affect a student's enrollment status. Students that had completed the content previously will still be marked as "Complete" in their enrollment records.
If you are looking to re-enroll a student in a course, you can follow the steps outlined in How do I re-enroll individual student(s) into a course or curriculum?
Does changing the completion criteria for a course retroactively mark users as completed?