The correct answer is option 2, Treaty of Versailles. The Treaty of Versailles was signed in 1919 after World War I and had several provisions that were considered humiliating by Germany. These provisions included requiring Germany to accept full responsibility for starting the war, paying substantial reparations, reducing its military forces, giving up territory, and accepting the loss of its colonies. The harshness of these terms created a sense of bitterness and resentment among the German population, which eventually contributed to the rise of Adolf Hitler and the outbreak of World War II. The other options mentioned, Treaty of Paris, Treaty of Lorraine, and Treaty of Brussels, are not relevant to the question and were not directly related to the causes of World War II.