What demand can increase when population growth is high?

Correct answer: Education, health and housing

Direct answer: A, high population growth can increase demand for education, health care, and housing. The reason is simple: more people need schools, teachers, hospitals, health workers, homes, water, and other services. If the number of people rises faster than facilities, existing services may become crowded and governments may need to expand them. Option A is correct because all three items are basic human needs and public-service requirements. Option B is wrong because population growth does not automatically increase the depth of a river; river depth depends on physical and hydrological conditions. Option C is wrong because mountains do not become older because more people are born. Option D is wrong because the colour of soil is not a direct measure of population demand. Memory cue: more people usually mean more needs and more pressure on services. This question asks about demand, not about a physical change in nature.