Economic Indicators of Developed Countries Steps: - Recall that developed countries feature advanced economies with high GDP per capita, strong institutions, and service dominance, while developing countries have emerging economies with high poverty and migration. - Assess option A: High rural-urban migration signals underdeveloped rural areas, common in developing countries. - Assess option B: Sophisticated financial markets indicate economic maturity and global integration, typical of developed nations. - Assess options C and D: Low service workforce and low school-leaving age reflect limited education and industrialization, more prevalent in developing countries. Why B is correct: - Developed countries, by definition, have mature economies with highly organized international financial markets that facilitate global trade and investment, as per World Bank classifications. Why the others are wrong: - A: High rural-urban migration occurs in developing countries due to uneven economic growth and job scarcity in rural areas. - C: Developed countries have a high proportion of workforce in service industries, often over 70%, unlike developing ones focused on agriculture. - D: Developing countries often have lower school-leaving ages due to economic pressures and …