Criteria for evaluating the questions researchers ask are: quantitative methods, qualitative methods, and social science methods methodological extremes, and law of the hammer personal interest, social importance and theoretical significance testable , generalizability, and heuristic describe behavior, determine causes of behavior, predict behavior and explain behavior

b.letter b

explanation:

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