The world economy, and so the economy of the European countries, faced many problems after the First World War. The result of these problems was the economic recession. Due to the war conditions of production that preceded these problems, a large part of the production capacities remained without labor, as well as large credit repayments that had to be made on the basis of loans during the war, as well as the demand for new loans. It was necessary to restore war debts and re-organize the peacetime mode of production. It means to revive production as a sound basis for the development of the economy, and ironically, this was achieved by re-launching arms production, primarily by Germany, for the upcoming needs of World War II, and thus revived national economies.
The answer is: A.