Which of the following political issues in east asia has raised the most security concerns?

The testing of nuclear weapons by North Korea hope i helped :)

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.

The process by weathered rock and mineral particles are removed from one area and transported elsewhere