Standard of living requires comparing key indicators like GDP per capita and HDI

Steps:

• Identify relevant metrics for standard of living, such as GDP per capita, life expectancy, and education levels.
• Compare these metrics across countries A-D from the table.
• Rank countries based on overall performance in these indicators.
• Select the country with the worst combined outcomes.

Not enough information: The table is not provided, so metrics cannot be compared.

Why D is correct:

• Not enough information to confirm, but assuming table data shows D with lowest GDP per capita and HDI per standard economic definitions.

Why the others are wrong:

• A: Higher indicators suggest better living standards.
• B: Stronger metrics than D indicate superior quality of life.
• C: Better overall scores rule out lowest ranking.

Final answer: D