Choice D: Ensuring absolute freedom of trade upon the seas.
Explanation:
Germany's declaration of unlimited submarine warfare in April 1917 was the precipitating element in the United States' entry into World War I. Wilson presented various arguments in support of open trade, the abolition of secret treaties and alliances, maritime freedom, and the establishment of the League of Nations. International law and the sea both enshrine the idea of freedom of the seas. It emphasizes the freedom to use the waters as one wishes. It also opposes confrontation over water. It would only jeopardize freedom if an international agreement where required. People got concerned when Germany began burning cargo ships. The promises provided by the Fourteen Points aided in bringing the Germans to the negotiating table after the war.
