In order to expand their empire while consolidating its administration, the han
a. established a trade monopoly, making village markets illegal.
b. erected monuments that represented their power. used large armies armed with crossbows, and drafted laborers for public works projects.
c. overturned all elements of qin rule. instilled terror and fear by massacring populations.

used large armies armed with crossbows, and drafted laborers for public works projects.

Explanation:

The Han dynasty, founded in 202BCE lasted for about four centuries and is credited with several developments, one of which is the extension of the Great Wall of China. Ruled by emperors, who in turn dispensed administration through kings of territories and civil officers, they collected taxes and conscripted men for the army as well as the labor corps to consolidate their power.

explanation:

may i ask what challenges?

try something like republic or democracy joined or something because its talking about a election party.