A........................
An economy that is based on mining or producing raw materials to be used in foreign industries is called "an export economy," sine this is usually more so the case for smaller countries that need to raise their GDP.
Answer:
The modern era has seen the rise of powerful imperial states, while the post-classical era was characterized by smaller city-states. C. The modern era is characterized by global exchange of ideas and goods, while this kind of exchange was mostly regional during the post-classical era
Explanation:
I believe it is A, built irrigation systems for farming :)
