Option 3: (C), (B), (A), (D) -> The chronological order is: (C) 'An Enquiry into the Nature and Cause of the Wealth of Nations' by Adam Smith (1776) - the foundational text of classical economics; (B) 'The Economic Consequences of the Peace' by John Maynard Keynes (1919) - written after WWI critiquing the Treaty of Versailles; (A) Great Depression (1929-1939) - the worldwide economic crisis that began with the stock market crash; (D) 'The General Theory of Employment, Interest and Money' by Keynes (1936) - written during the Great Depression, revolutionizing macroeconomic theory. -> correct