Choose the best answer

Ithink that the missing word is mixed

Ibelieve it is- a mixed economy offers some protection for consumer rights but still allows a good deal of choice.

Wheres the answers to 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.