1. Russia - 17098242km2
2. Canada - 9984670km2
3. USA - 9826675km2
4. China - 9596961km2
5. Brazil - 8514877km2
6. Australia - 7741220km2
7. India - 3287263km2
8. Argentina - 2780400km2
9. Kazakhstan - 2724900km2
10. Algeria - 2381741km2
The answer is
The tensions between the us and the user led to increassed weapon developement
I believe your answer would be A- Farmers and urban dwellers.
Hope this helps. Correct me if I'm wrong.
Agriculture and forestry??????