If a country's population pyramid has a very broad base and a very narrow top, what type of population may it indicate?

Correct answer: Youthful population

A population pyramid shows the number or share of males and females at different ages. A very broad base means that many children are being born or that children make up a large part of the population. A narrow top means that relatively few people reach or remain in the oldest age groups, or that older people form a small share. This combination is commonly associated with a youthful population, so option A is correct.

The shape also suggests that fertility has generally been high and that the population may grow quickly if large child cohorts later enter reproductive ages. It does not describe an ageing population, whose pyramid usually has a narrower base and a relatively wider upper section. It cannot mean that only working-age people exist, because the broad base clearly represents children. Nor can it indicate zero births; zero births would make the base shrink drastically. Therefore, the broad base and narrow top support option A.