Which of the following statements regarding the provisions of the Treaty of Versailles is NOT correct?

Under the Treaty of Versailles (1919), the port city of Danzig (Gdańsk) was detached from Germany and made a 'Free City' under the protection and administration of the League of Nations (with Poland given special customs/port rights), not placed under British authority. All other statements (Eupen-Malmedy to Belgium, West Prussia/Posen to Poland, and Alsace-Lorraine to France) are correct.