The correct option is D A part of tertiary sector helps in transportation of raw materials and finished products.
People working in the primary sector depends on the environment, like fishing, farming etc. In the secondary sector, people work in industries like manufacturing; construction etc. Tertiary sector acts as a medium of transportation and communication between the market, primary sector and secondary sector. Developed countries have more people in the secondary and tertiary sector while developing countries have more people in the primary sector.