Argument supporting that psychology is a science

Psychology is the science that studies the behavior and mental processes of individuals (psychism). To say that psychology is a science means that it is governed by the same laws as the scientific method which govern other sciences: it seeks objective knowledge, based on empirical facts.

Psychology is considered a science because it uses empirical reasoning and the scientific method to ask questions and examine hypotheses about human behavior and mental function.

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

the 4th option is the answer