The population of a nation in the working age group is generally grouped between __________________ .

Correct option is A

The answer is (a) 15–59 years.
The working age population refers to the group of people within a country who are considered to be of working age and are typically available for employment. This group is often defined by an age range that is considered to be suitable for participating in the labor force and contributing to the economy. The age range for the working-age population may vary slightly from country to country, but it generally falls between the ages of 15 and 59 years.
Here's a breakdown of the age range:
· The lower age limit is usually set at 15 years, as many countries consider this to be the minimum age at which individuals are legally allowed to work (subject to certain restrictions and regulations).
· The upper age limit is set at 59 years, as many countries consider this to be the age at which individuals are eligible for retirement benefits and pension schemes.