The correct option is Higher salaries in such countries..
Explanation
The migration of highly skilled professionals (such as engineers and doctors) from developing to developed countries is commonly referred to as Brain Drain. This phenomenon is influenced by "push factors" in the home country and "pull factors" in the destination country.
Analysis:
- Better quality of life. is incorrect: While "better quality of life" is a major pull factor, it is a broad concept encompassing social, environmental, and infrastructural aspects. It is not exclusively an economic driver, although it correlates with economic prosperity.
- Higher salaries in such countries. is correct: The primary economic driver is the significant wage differential between countries. Skilled professionals migrate to maximize the return on their human capital investment, as developed nations offer substantially higher salaries and purchasing power for the same skill sets compared to developing nations.
- Lack of jobs in India. is incorrect: While unemployment or underemployment can be a push factor, technically qualified persons often do have job opportunities in India. The migration is driven more by the disparity in remuneration (pull of higher wages) rather than an absolute lack of employment.
- Political reasons. is incorrect: Political reasons constitute a political driver, distinct from economic incentives.
Key Takeaway:
The fundamental economic rationale behind the migration of skilled labor (Brain Drain) is the income disparity or wage differential between the source and destination economies.