An iron triangle is a
a)loose, impermanent relationship between agencies, congressional committees, experts, and interest groups
b) special committee appointed by the president to investigate the activities of congress
c) panel of experts on a major network news show
d) stable, permanent relationship between agencies, congressional committees, and an interest group

D) stable, permanent relationship between agencies,congressional committees, and an interest group

i go with [ a

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