Select the correct statements regarding macroeconomics.

(A) Macroeconomics deals with the aggregate economic variables of an economy.

(B) Macroeconomics emerged as a separate subject in the 1930s due to Keynes.

(C) Macroeconomics is a combination of households, firms, and the government sector only in open economy.

(D) Macroeconomics takes into account various inter - linkages which may exist between the different sectors of an economy.

Choose the correct answer from the options given below:

Option 1 -> Includes statements (A), (B), and (D). Statement (A) is correct as macroeconomics deals with aggregate variables like GDP, inflation, and unemployment. Statement (B) is correct as macroeconomics emerged as a distinct field in the 1930s with Keynes' General Theory (1936). Statement (D) is correct as macroeconomics studies inter-linkages between sectors. Statement (C) is excluded, which is appropriate.

Option 2 -> Includes statement (C) which is incorrect. Macroeconomics studies households, firms, and government in BOTH closed and open economies, not only in open economies.

Option 3 -> Includes all statements including (C), which makes it incorrect.

Option 4 -> Excludes statement (A) which is a fundamental correct statement about macroeconomics, and includes incorrect statement (C).

Hence, Option 1: (A), (B) and (D) only -> Statement (A) correctly identifies that macroeconomics studies aggregate economic variables. Statement (B) accurately credits Keynes for establishing macroeconomics as a separate discipline in the 1930s during the Great Depression era. Statement (D) correctly highlights that macroeconomics examines inter-sectoral linkages in the economy. Statement (C) is incorrectly excluded as it falsely claims these sectors exist only in open economies, when they actually exist in both closed and open economies (open economies simply add the foreign sector). -> correct