Explanation:

- Option:1, Economic growth:

- This refers to an increase in the production and consumption of goods and services, leading to a rise in a country's economy over time.

- It's driven by factors like investment, technology, and workforce enhancements.

- While important, it doesn't solve the fundamental economic problems.

- Option:2, Social welfare:

- This involves programs and policies designed to improve the well-being of individuals in a society.

- It aims at providing support in areas like health, education, and economic security.

- This is more about addressing social equity and quality of life.

- Option:3, Economic system:

- This is the correct answer.

- It defines how a country organizes its resources and policies to address economic problems.

- Different systems (e.g., capitalism, socialism) solve central economic issues in varied ways.

- Option:4, Socialism:

- An economic and political theory advocating for collective or governmental ownership and administration of production and distribution.

- It focuses on reducing inequality and providing social support.

- It is a type of economic system.