I need the answers to The Unification of China Quiz please!

Nice to see you again, prefernottosay! I have all the answers, but we did it in LL.
1 D (Axles of carriages were the same length)
2 A (Harsh laws are needed to keep order in society)
3 B (To keep nomads to the north)
4 A (Because Confucius believed it is the model for the other four relationships)
5 B,F (Because they treated the people well | Because they presided over services to spirits and to Heaven)
6 B (Because over time, water is stronger than rock)
7 B,C (Iron made stronger, more effective farm tools and increased crop yield. | Iron weapons spread to the masses, contributing to the Warring States period.)
8 Huang River, loess, agriculture

9 -
|The Zhou expand their lands through conquest.
|Zhou leaders place family members in charge of faraway states.
|Over time, ties between Zhou kings and faraway nobles weaken.
|Group of nobles join with nomadic invaders to try to overthrow the king, but fail.
A (To predict the future)

THANK YOU SO MUCH I GOT 100

for 9, it says its still unanswered. ima turn it in anyway lol

Thanks so much I got 💯

ty got 100%