Answer:
Track changes
Step-by-step explanation:
-Review is a tab that has commands that can be used to modify the documents, for example, add comments and protect a document.
-Comment is a tool that allows you to add a box in the right side of the document to write thoughts or opinions.
-Track Changes is a tool that helps you to see all the changes that have been made to the document.
-Balloons is an option that allows you to pick how you want to see the revisions: by using balloons on the side or by showing them in the document.
According to this, the option that marks all modification made within a document is track changes.