Concept:Agriculture in developing countries tends to use abundant labour rather than heavy machinery.
Explanation:Developing countries often have a large and growing population, which provides plenty of workers.
At the same time, capital for machines is limited, so farms depend more on manual work.
This is known as a labour intensive method of farming.
Because this method needs many hands, the agricultural sector employs a huge number of people.
Mechanized farming requires fewer workers, while high wages and abnormal profits are not typical in this sector.
Therefore, the large employment in agriculture is mainly due to the adoption of labour intensive methods.
Answer:A. labour intensive method is mostly adopted