Broad base and narrow peak of age-sex pyramid is of _____________.

Correct option is D

Introduction
An age-sex pyramid with a broad base and a narrow peak is characteristic of an expanding population. This shape signifies high birth rates (broad base) and high death rates/lower life expectancy (narrow peak). Among the options, Nigeria is a developing country typically associated with this rapidly expanding population structure.
Information Booster
· Base Shape: Broad base indicates a high proportion of young people (high birth rate).
· Peak Shape: Narrow/Pointed peak indicates a low proportion of elderly people (lower life expectancy or high death rate).
· Population Type: This shape is typical of a rapidly expanding population (Stage 2 of the Demographic Transition Model).
· Country Example: Commonly found in developing or less economically developed countries (LEDCs), such as Nigeria.
· Implication: Indicates a young population with a high dependency ratio and a high potential for future growth.
Additional Points
· Japan, France, and Australia: These are developed countries that generally have contracting or stable populations. Their age-sex pyramids typically have a narrower base and a broader peak, representing low birth rates and high life expectancy.