Backyard gardens seems a bit broad whereas the rest focus in on a certain subject relating to gardens.
I’m pretty sure that the answer is A. When people are arguing they give reasons of why they’re right, so I would think it’s A. Hope this helped, and sorry if I’m too late!! :D
1. A
2. F
3. C
4. G
5. B
6. J
7. B
8. J
Good luck!
The answer is "a solution to the problem"