Concept:In developing countries, most of the labour force is engaged in natural-resource-based activities rather than in manufacturing or services.
Explanation:The primary sector includes farming, fishing, forestry, hunting, and mining.
These activities generally require large numbers of unskilled workers and do not demand formal education or advanced training.
Developing countries usually have less industrialisation, so the secondary and tertiary sectors provide fewer employment opportunities.
As a result, the majority of the working population depends on primary activities for jobs and income.
This makes the primary sector the major employer of labour in such economies.
Answer:C. primary sector