Step 1: Overview of Economic Sectors.
The primary sector involves activities related to natural resources, such as agriculture, mining, and fishing. A significant portion of the working population in many developing countries is employed in this sector.
Step 2: Analysis of options.
- (A) Primary sector: The primary sector employs the largest part of the working population, especially in rural and developing regions.
- (B) Secondary sector: This sector includes manufacturing, but it does not employ as many people as the primary sector in many economies.
- (C) Tertiary sector: The tertiary sector involves services, but in many countries, the primary sector still has a higher employment rate.
- (D) None of these: This option is incorrect, as the primary sector employs the most people in many countries.
Step 3: Conclusion.
The primary sector employs the majority of the working population, making the correct answer (A) Primary sector.