Which statement correctly explains the relation between population size and density?

Correct answer: Density is understood by seeing population with area

Direct answer: Option C is correct. Population density tells us how many people live in a given unit of area. The usual formula is population density = total population ÷ total area. Therefore, density cannot be understood from population or area alone. Step by step: take the number of people, take the size of the land, divide the first by the second, and compare the result. Option C works because it correctly says that population must be considered together with area. Option A is wrong because a large area can have high, medium, or low density depending on its population. Option B is wrong because a small area does not always have high density; it may have very few people. Option D is wrong because rainfall can influence settlement, but density also depends on jobs, relief, soil, water, transport, and history. Memory cue: density means people per area, not people alone.