To communicate with others about specific parts of a document, or leave feedback, you can insert a ___________ into the document.

Inserting a comment into a document allows for targeted communication regarding specific parts of the document. Comments serve as a way to provide feedback or ask questions without altering the main content. This functionality is particularly useful in collaborative environments where multiple users may be reviewing, editing, or discussing a document. By adding a comment, individuals can address particular sections and streamline the discussion process, ensuring that feedback is clear and contextual.

Other options like notes, markers, or highlights do not provide the same interactive and conversational tone that comments do, as they may not include features for replying or threading discussions directly related to the text. Comments are specifically designed for collaboration and communication within documents, making them the optimal choice for this purpose.