The correct answer is B. The laws and traditions lived on, flourishing through the Byzantines who lived in the East.
Byzantine Empire preserved not only Roman but Greek traditions in their culture. The Roman legal tradition was maintained.
The Byzantine Empire wanted to keep legal stability in the territory and they tried to compile Roman laws through the years, to be at hand when needed. Emperor Justinian I compiled the Justinian Code in 533 AD and contained over 2000 previous legal Works. Years later it become the foundation for the legal work in Europe.