Option 4: (A) - (III), (B) - (IV), (C) - (I), (D) - (II) -> In macroeconomics: (A) Inventory represents stock of unsold goods and is a component of (III) Investment (inventory investment). (B) Consumption is household expenditure which is a function of (IV) Household Income. (C) Ex-ante is a Latin term meaning 'before the event', referring to (I) Planned or intended values. (D) Ex-post means 'after the event', referring to (II) Actually happened or realized values. These ex-ante and ex-post concepts are fundamental in Keynesian economics for understanding planned vs actual economic variables. -> correct