The answer for this question is: Write
The main duty of a historian is to record a specific event in human history that could be passed throughout future generations.
Because of this, the most important skill to be had for historians is the ability to transform the event into a medium that could be read and understood by the generation after us.
The answer for this is A. The Congress-House of Representatives and the senate
I'm not sure exactly what you're asking... China is the largest country but next to the biggest region would be Mongolia located on east Asia, hope this helps