How is the age group 15 to 59 years generally described?

Correct answer: Main working-age population

The age group from 15 to 59 years is generally described as the main working-age population. People in this range are more likely to be physically and socially able to work, earn income, produce goods and services, and support dependants. This age boundary is a broad statistical convention, not a rule that every person in the group works. Some may study, be unemployed, perform unpaid care work, or be unable to participate because of illness or disability.

Thus, option A is correct. Children are usually placed in a younger age group, while people aged 60 years and above are commonly treated as older or elderly dependants in population analysis. Option D is too narrow because not all people aged 15 to 59 are students. The group is called working-age because it represents potential labour capacity, not because every individual is actually employed.