The correct answer is the third: "the German invasion of Rhineland".
Treaty of Versailles oficially ended World War I in 1919. The two parties were, on the first hand the victorious Allies of World War I or Entente Powers ( France, Great Britain and Russia) and, on the other hand, Germany which was the largest potency among the defeated.
The treaty involved several territorial agreements and war reparations that were supposed to be paid by Germany to the Allies as a compensation for the damage caused.
The treaty was broken by Germany in 1936, when Hitler decided to stop paying the debt and invaded Rhineland, which had become a demilitarized area after WWI according to the Treaty of Versailles.
The German broke the treaty of Versailles by invading the Rhineland
Germany began invasion of Rhineland on 7 March 1936 when German forces invaded the Rhineland and took control over their lost land. Hitler actually started rearmament of Germany immediately Nazi party took over Germany. He felt Germany shouldn't be subdued and should be the number one race in the world.
Actions in which the Germans violated Treaty of Versailles are;
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