Final answer:
The '-i' option with the rm command prompts the user for confirmation before deleting files.
Step-by-step explanation:
The option that can be used with the rm command to prompt before deleting is -i. When this option is used, rm will ask for confirmation before removing each file, giving you a chance to avoid accidentally deleting important files. To use it, type rm -i filename, where filename is the name of the file you want to delete.