Concept:Rural-urban migration is the movement of people from villages to cities, which directly reduces the population left behind in the village.Explanation:The source region is the rural area from which people move out.When many people leave this region, its population falls.This decrease in the number of people living in rural areas is called rural depopulation.Urban depopulation is wrong because people are moving into cities, not leaving them.Rural employment and rural unemployment are not the main direct effects of this outward movement.Answer:A. rural depopulation