Answer:
1. non-defining
2. defining
3. defining
4. defining
5. non-defining
6. defining
7. defining
8. non-defining
9. non-defining
not sure with this but i tried my best
I think the answer is B. As long as the clause after the colon is independent, you can capitalize it.
I think B would fit. Im not 100 percent sure, but B shows that the wall is not needed and it clearly states that in the poem hope this helped!