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

Correct answer: Working-age group

The 15–59 years age group is generally called the working-age population. People in this broad range are more likely to be physically and socially able to work, earn income, produce goods and services, and support dependants. This classification is a statistical and demographic generalisation; it does not mean that every person in this age group is employed or able to work.

Option C follows directly from the usual age-structure classification. Children are normally treated as young dependants, and older people are usually placed in the elderly-dependent group. The phrase “only student group” is too narrow because people aged 15–59 may be workers, students, caregivers, or unemployed. Thus, working-age group is the accurate answer.