If density increases after a good road is built in an area, which factor is mainly working?

Correct answer: Transport and connectivity facilities

Correct answer: D, transport and connectivity facilities. Population density means the number of people living in one unit of area, usually one square kilometre. A good road makes travel easier and connects residents with markets, schools, hospitals, workplaces and other services. Because access improves, workers, traders and families may be attracted to the area, or people already living there may be able to settle more permanently. Thus transport can influence where people live and can raise density over time. A is incorrect because rainfall may influence farming and settlement, but the question directly points to a road. B is incorrect because soil colour alone does not explain improved access or movement. C is incorrect because an area does not become zero when a road is built. Memory cue: better roads often mean better access, and better access can attract people; density is people divided by area.