D. The Central Government had no power to tax
The achievements were that it managed to raise its own army and create its own currency and government. The failures were that it didn't manage to become internationally recognized, and they eventually became bankrupt. Another thing was that there was a lot of internal strife and division.
Feudalism was successful because it allowed the control of land in exchange for service or labor.
The idea of active citizenship
--
China didn't have anything to do with citizenship, cities like Athens and Sparta had laws about citizenship and what a citizen could do and what a non-citizen could and couldn't do. China didn't have anything like that at the time/\.
