If a country has a small elderly population but also a small working-age population, what else should be examined to understand its age structure?

Correct answer: Share of the child population

A complete understanding of age structure requires looking at all major age groups, not just one or two. If the elderly and working-age groups both form small shares, the remaining share may belong largely to children, but this must be checked with actual data. A high child share would suggest a youthful population and potentially high child dependency, while another distribution could produce a different conclusion.

Option A is correct because the share of children is the missing demographic information needed to interpret the pattern. Rainfall, land area, and language may matter for other geographical or social studies, but they do not complete an age-structure analysis. The wording says the child share should be examined, not that it must automatically be large. That makes the conclusion careful and valid.