Select the option that can be used as a one-word substitute for the given group of words.
Study of statistics of population

Correct option is D

The correct one-word for the given group of words is (d) Demography — Demography.
Demography is the study of population data such as birth rate, death rate, age distribution, migration, and other statistical features of human populations. Hence, it perfectly matches “study of statistics of population.” (Hindi meaning: जनसांख्यिकी)
Example: Demography helps governments plan schools, hospitals, and jobs based on population trends.
Meanings of the given other options:
· (a) Geography: study of Earth’s surface, places, and physical features (भूगोल)
· (b) Holography: technique of creating 3D images using lasers (होलोग्राफी / त्रिविमीय चित्र तकनीक)
· (c) Topography: detailed mapping/study of surface features of an area (स्थलाकृति / भू-आकृतिक विवरण)