Planet Names in the solar system, definitions of terms - star, planet, asteroid, comet, meteor, meteorite, solar system, satellite; Rotation and circulation of the Earth - around the refugees, how long they last, what are their consequences.

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.