A change in global or regional climate patterns
The factors that contribute to this question are immense. However, I would argue that the lack of food and water and the overall punishment of enslaved peoples are the biggest players.
European nations came to the Americas to increase their wealth and broaden their influence over world affairs
The most likely answer is A) Germany would be angry about the treaty's details. Some parts of the Treaty of Versailles that would anger Germany would be; the creation the New League of Nations, one which Germany was not allowed to join until 1926. Some other parts of the treaty reduced the military power prohibiting Germany from possessing certain classes of weapons, and even removing some territories from the country. German government even signed the treaty under protest inciting violent responses from certain groups. Making this the correct answer.
