Which service demand can increase when population growth is high?

Correct answer: Education and health services

Direct answer: A, education and health services. When the number of people increases, more children may need schools and more people may need doctors, hospitals, vaccination, and other health facilities. Planners therefore study population growth before deciding how many classrooms, teachers, clinics, and hospitals may be required. Option A is correct because education and health are basic services used by people and their demand can rise with population. Option B is wrong because mountaineering is a specialised activity, not a basic service required by every growing population. Option C is wrong because songs do not represent a necessary public service in this context. Option D is wrong because river worship is a cultural practice and does not measure general service demand. Remember: more people usually mean greater need for schools, hospitals, water, housing, and transport.