Economics is the study of how society
a.
can gain increasing amounts of resources
b.
uses scarce resources to satisfy its needs and wants
c.
invests its money in different kinds of businesses
d.
prevents shortages of its most popular goods and services

the answer is b-uses scarce resources to satisfy its needs and wants

Explanation:

I did the test

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.

it is a better alternative