Final answer:
To undelete a file or folder, go to the Recycle Bin, locate the item, and select 'Restore' to move it back to its original location. If it's not in the Recycle Bin, it may require a file recovery program to undelete it.
Step-by-step explanation:
If you want to undelete a file or folder, you would go to the B) Recycle Bin. The Recycle Bin is a special folder where deleted files are temporarily stored before they are permanently erased from your computer. To undelete or restore a file, you should open the Recycle Bin, locate the file or folder you want to restore, right-click on it, and select 'Restore'. This will move the file back to its original location. If the file isn't there, it might have been permanently deleted or never placed in the Recycle Bin, in which case you might need to use a third-party file recovery program to attempt to undelete it.