How does the hydrosphere behave as a system

It is a closed system , the earth operates on a water budget in which deficits in one part are balance by gains in another part

Ibelieve it would be d. philosophy.hope it !

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.