Which of the following describes a system of basic services for citizens at every stage of life? 1. gross domestic product

2. social services benefits

3. pensions and healthcare

4. a cradle-to-grave system

A system of basic services for citizens at every stage of life is a cradle-to-grave system.

Explanation:

1 is not correct because it represents the production in an economy in a particular time frame (usually a year).

2 is not correct because it doesn't provide service to all of the age groups.

3 is not correct because it is not meant to provide services to all age groups.

4 is correct because it is a system that provides services to all citizens, from all age groups, or rather from their birth to their death, thus throughout all of their life stages.