Which option gives the correct explanation of population density for advanced comparison?

Correct answer: It shows human population pressure per unit area

The direct answer is A: population density shows human population pressure per unit area. Density is calculated as population divided by area, commonly written as population density = total population / total area. For example, if 1,000 people live in 10 square kilometres, density is 100 people per square kilometre. Step by step: take the total population; measure the area; divide the first by the second; compare the result with other areas. Option A is correct because it describes how many people occupy or place pressure on a common unit of land. Option B is wrong because total population alone is population size, not density. Option C is wrong because births are one demographic event and do not show the number of people per unit area. Option D is wrong for the same reason: deaths alone cannot express population concentration. Density does not by itself explain income, services or every social condition, but it is useful for comparing crowding. Memory cue: density means “how many people in how much area.”