Answer:
c. tertiary
Step-by-step explanation:
There are three sectors in a market economy. The primary sector, which consists of the agricultural sector and the exploitation of natural resources, the secondary sector, which consists of the manufacturing industry. This sector transforms the resources extracted from the primary sector into manufactures. The third sector is the service sector and encompasses any and all services rendered to other sectors and to society as a whole. For example, shuttle service, cleaning service, consulting service, etc. Therefore, the third alternative is correct.