A citizen is: A. an individual who has certain responsibilities in a political community
B. an individual who enjoys certain rights in a political community
C. an individual that is legally recognized as a participating member of a political community
D. all of the above

D

Explanation:

A citizen is a combination of all the above statements

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

can you explain it better