Population density is calculated as:

Correct option is A

The correct answer is (a) number of persons living per unit area
Explanation:
. Population density measures concentration of population.
. Calculated as population divided by land area.
. Expressed as persons per sq km.
. Helps in planning resources.
. Used in census studies.
Information Booster:
. India’s density (2011) was 382 persons/sq km.
. Density varies widely across regions.