Development correlates with high service sector employment

Steps:

• Recall that economic development shifts employment from primary (agriculture) to secondary (industry) to tertiary (services) sectors, per Clark's model.
• Examine service sector percentages: A (55%), B (20%), C (30%), D (20%).
• Identify the highest service employment as the indicator of most advanced development.
• Select country A with 55% in services.

Why A is correct:

• In Clark's three-sector model, developed economies feature over 50% workforce in services due to post-industrial focus on knowledge and consumer activities.

Why the others are wrong:

• B: High secondary (60%) suggests industrializing stage, not full development.
• C: Moderate service (30%) indicates transitional economy, less advanced than A.
• D: High primary (40%) reflects agrarian, underdeveloped status.

Final answer: A