Final answer:
The option that can be inserted into a formula to automate the checking of a box, raising of a flag, or filling in of a star is b. 'Return'.
Step-by-step explanation:
The option that can be inserted into a formula to automate the checking of a box, raising of a flag, or filling in of a star is b. "Return". When using a programming language or spreadsheet software, the keyword or function 'Return' is often used to perform actions based on certain conditions. For example, if a checkbox is checked, the 'Return' function can be used to automatically flag a task as completed or fill in a star to indicate its importance.