19. This type of erosion picks up materials and transports them in the air, often causing the abrasion of surfaces. Please help!!

I  cant see the question.

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.