Explanation:
The Roman empire was one of thr bigest empires ever, so what does it mean? It means that they occupied a large part of territory. They occupied a lot of countries, nations. So those nations accepted their culture, their philosophy and perspective. Romans were one of the best intelectual empires at the time, with academies, and schools. So all of their ideas at the time was part of their schooling and other nations that accepted their culture were learned like that, so when they decided to go to their mainland they just pass those knowledge to the people. After all, all nations that were occupied as time goes by defended themselves and gained their freedom. You can change nations, etnics, country and everything but ideas will always remain the same and they we'll spread. Sorry for some mistakes, my english ain't perfect.
Answer:
B
common sense
they always had fresh drinking water and a place to dump sewage
