Why should source area and destination area be studied separately in migration analysis?

Correct answer: Because the source loses people and the destination gains people

The correct answer is B. Migration connects two places, but its immediate population effect is different at each end. The source area is the place from which people leave, so it may lose population, workers or particular age groups. The destination area is the place where migrants arrive, so it may gain population, labour and demand for housing, transport, schools and other services. The effects are not necessarily identical because the two places can have different economies, resources and age structures. A is wrong because the source loses while the destination gains. C is wrong because a source area must have people who can migrate. D is wrong because the destination is directly affected by arrivals. Studying both areas also prevents the mistake of counting the same movement as only a loss or only a gain. Memory cue: every migration flow has two sides—departure at the source and arrival at the destination.