Final answer:
The option to insert placeholders for data that might change is c. Field. Fields are used to create dynamic placeholders for information like dates, page numbers, document titles, etc.
Step-by-step explanation:
The option to insert placeholders for data that might change is c. Field. Fields are used in applications like Microsoft Word to create placeholders for dynamic information. They can be used for inserting information such as dates, page numbers, document titles, and more. Here's an example: if you want to insert the current date in a Word document, you can use the Field option to create a placeholder that automatically updates to the current date whenever you open the document.