Correct Answer: Migration of skilled workers to other countries

Solution : The correct answer is (a) Migration of skilled workers to other countries

In the context of human capital formation. Brain drain typically occurs when highly skilled and educated individuals leave their home country to seek better opportunities, higher salaries, or improved living conditions in another country. This migration of talented individuals can result in a loss of human capital for the home country, as it depletes the workforce of skilled professionals who could contribute to the country's development and growth. Brain drain is a concern for many developing countries, as it can hinder their efforts to build a strong and skilled workforce domestically.