If population grows rapidly because the death rate is falling, which service planning can become immediately important?

Correct answer: Health education, water and housing

Direct answer: Option A. When the death rate falls, more people survive, and the size of the population may increase rapidly if births remain significant. A larger population needs more drinking water, sanitation, houses, schools, health facilities and public-health education. Planning these services early helps prevent overcrowding, unsafe water use and pressure on existing facilities. Option A is correct because health education, water supply and housing respond directly to the needs of a growing population. Option B is wrong because measuring mountains does not provide an essential population service. Option C is not a real response to population growth and has no role in service planning. Option D is wrong because stopping the census would remove important information needed to estimate population size and plan facilities. The question asks what becomes immediately important, so choose basic services rather than an unrelated physical-geography activity. Memory cue: falling deaths mean more survivors, and more survivors require more services.