Concept:In most developing countries, the primary sector, especially agriculture, employs the largest share of the labour force.
Explanation:Developing countries generally have low per capita income and low levels of industrialisation.
A large portion of the population lives in rural areas and depends on farming for food and income.
Agriculture requires little formal training or capital, so it is accessible to most workers.
Modern sectors such as mining and manufacturing cannot absorb enough workers due to limited capital and weak infrastructure.
Trading is common, but it remains secondary to agriculture in terms of employment.
Thus, a very large percentage of the labour force in developing countries is engaged in agricultural activities.
Answer:C. agriculture