Answer:
A. reserves were established for black groups
Explanation:
In the provinces were divided into Chinese judged by chief;Under the chief were the head responsible for the villages. The Empire has had a fixed army, where the main duty was to defend/develop the empire. The king/Caesar was a symbol of the unit because he was half-divine.
All could be said but specifically F or/and D the most likely is F though
Invention of new weapons/gases was HUGE, but Disease and famine was also a large factor
