The answer is A. A unitary system
Legalism does not concern itself with familial matters. In addition, Legalism only focused on family members in their capacity as citizens. On the other hand, Confucianism consisted of roles that were to be assumed by family members in an ideal society. Hope this helped!
Every government has to have their own responsibility. You can't have two governments branches doing all the work while one sits back and just watches. It is the governments responsibility to keep this nation safe and secure, that means everybody must do their part.
i really do hope this helps :)