Here's the thing. First question, Lu Ye Baoji belongs to Liao Taizu. Yuan Hao is the emperor of Xixia. Akuta is Jin Taizu. They are only the rulers of their respective regions, but they don't rule the whole of Chinese mainland. They just studied China culture in their own areas, imitated the Song Dynasty system and promoted the feudal system. However, the time of great ethnic integration in China should be from the end of the Eastern Han Dynasty to the Wei, Jin, Southern and Northern Dynasties.
The second question, pay attention to this sentence, Liao, Jin, Yuan and Three Dynasties were prosperous times, and the world was prosperous, not human resources to strive for peace and security. It was the Song Dynasty that saved itself, instead of confronting the powerful Liao, Jin and Yuan. The question of strength does not appear in the title. The question is what this statement reflects and should be closely related to the topic.
The third question, the meaning of the title, is to let the governors donate money regularly. "Gold" is a tribute that the princes offer to the imperial court every year. If you don't follow this, you will eliminate his country. His land belongs to the county. From then on, vassals can only take taxes. This involves a problem in history, winning the championship with gold. In order to sacrifice to the ancestral temple, Liang Wudi asked Liehou to donate money, and on the pretext of insufficient weight or poor quality of the gifts, he abolished 106 Liehou, further strengthening centralization. They didn't lose their fiefs, but they were managed by counties under the state, and governors could only collect rent taxes. Post-country or post-country, kingdom or kingdom. The enfeoffment system still exists, so you should choose B.