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.
![Which of the following statements about economic sectors are true](/tpl/images/03/00/vvOIxzP1gcgAmQYG.jpg)