Concept:Rural-urban drift is the steady movement of people from rural farming areas to towns and cities in search of better living conditions.
Explanation:Most agricultural activities in Nigeria take place in rural areas.
In recent times, the active labour force, especially young people, has been leaving these rural areas for urban centres.
This movement is known as rural-urban drift.
People migrate because cities offer better-paid jobs, education, healthcare, and social amenities.
As the working population leaves the rural areas, fewer hands remain to carry out farming activities.
Agriculture therefore loses its vital labour force.
The other options do not directly explain this loss of labour.
A lack of effective agricultural policy affects farming methods, not the physical movement of workers.
Employment opportunities in agriculture would encourage people to stay rather than leave.
Low prices of farm products may reduce farmers' incomes, but the major cause of labour shortage is the migration of workers from rural to urban areas.
Answer:C. rural-urban drift