2. How can improved infrastructure improve or change economic activity? What are at
least three examples of improved infrastructure that have a potential positive impact on
economic activity?

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.