If the population of an area declines while its area remains the same, which question remains important after density falls?

Correct answer: Has service distribution changed according to the new population condition?

Answer: A, whether service distribution has changed according to the new population condition. Density equals population divided by area. If population decreases and area stays constant, the numerical density falls. However, a lower number does not automatically tell planners whether schools, clinics, transport, water supply or other services are located where the remaining population now lives. Some settlements may lose users while other places may still need support. A is correct because planning must respond to the new spatial and population pattern, not just to the changed number. B is wrong because an unchanged area has not become zero. C is wrong because low or falling density is not automatically development or decline; its meaning depends on causes and conditions. D is wrong because a fall in population can be measured through population data. Memory cue: after calculating a new density, ask whether services still match the people and their locations.