Option 3: (A) - (I), (B) - (III), (C) - (IV), (D) - (II) -> Let's match each concept correctly: (A) Macroeconomics studies aggregate measures like GDP, inflation, and unemployment, matching with (I). (B) Mixed economy combines government intervention with market mechanisms, matching with (III) where some decisions are governmental and others are market-driven. (C) Market is a platform for free exchange between economic agents, matching with (IV). (D) Centrally planned economy has government making all major economic decisions, matching with (II). This combination correctly pairs each economic concept with its proper definition. -> correct