There are certain skills that are required to be a good team member or team leader. A main characteristic of the required skills would be those that can be used in interacting with other people, since that is a main feature when working in teams.
From the given options, only one skill would be most suitable to be used when dealing with other people, which is (C) listening.
A privacy concern the family may have is IP tracking, and unless they have a good VPN is location tracking since they are all uploading pictures to this website.
