By the Treaty of Versailles, Germany was guilty of war, and had to pay for all losses and damages in the First World War, as well as to reduce the number of troops, warships, etc. Germany initially refused to pay damages for being attacked by Britain and France in January 1921. The Germans were bitter about their small army. The general situation, due to the payment of debt, was in Germany bad, economically, politically, socially. This was used by Hitler to gain authority, but also to violate the Treaty of  Versailles in three ways: In 1936, Hitler introduced a military obligation and tested his troops in the Spanish Civil War, in the same year he transferred troops, contrary to the Treaty of Versailles, to the demilitarized Rhineland, and in 1938, attacked Austria and proclaimed Anschluss.
The answer is: D.
