The fourth answer is correct (D).
During the First World War the US was the largest supplier of manufactures, weapons and food to Europe, ie war warmed the American economy.
At the turn of the 1920s the US lived through the golden age, the American lifestyle was based on production and consumption. However, this excitement has led entrepreneurs to increase lending and increase their production, causing an overproduction that did not find demand for their products. This was the context that led the United States to the Great Depression of the 1930s.