Option 1 -> 1909 was too early, before World War I even began.
Option 2 -> 1919 was immediately after World War I and the Treaty of Versailles.
Option 3 -> 1929 was the year of the Great Depression, not when this book was written.
Option 4 -> 1936 was when Keynes published "The General Theory of Employment, Interest and Money", not this book.
Hence, Option 2: 1919 -> "The Economic Consequences of the Peace" was written by John Maynard Keynes in 1919, immediately following World War I and the Paris Peace Conference. Keynes, who had been part of the British delegation, wrote this influential critique of the Treaty of Versailles, arguing that the harsh economic reparations imposed on Germany would lead to economic disaster in Europe. The book became a bestseller and established Keynes as a prominent economic thinker. -> correct