Final answer:
The Sync Center feature in Windows 7 lets a remote user edit files offline and sync them automatically when the network is available again.
Step-by-step explanation:
The feature that allows a Windows 7 remote user to edit a file offline and then automatically update the changes when back in the office is B. Sync Center. Sync Center is a feature in Windows 7 that enables users to work with files offline and then synchronize the changes with the network folder when the connection to the network is restored.
Windows Defender is an antivirus and security application, Windows Aero is the graphical user interface and theme of Windows 7, and HomeGroup is a feature for sharing files and printers on a home network.