Tang Dynasty was able to strengthen China thru the efforts of its Tang Taizong and Empress Wu in which the former brought back China's government and the latter empowered women. The Song dynasty continued the good governance and elevated the military system thru systematized testing.
B. a crime
For a president to be impeached, he/she has to be charged with crimes while in office.
There is not much that they agreed on, and much of it is based on who you ask. They did however mutually agree that the US was different than other nations and that it was better.