The correct option is "promised that the Arab provinces of the Middle East would be independent after the war"
After World War I the British Empire saw its period of maximum extension, since the United Kingdom obtained the control of Palestine and Mesopotamia through the mechanism of the mandate of the League of Nations, after the fall of the Ottoman Empire in the Near East, as well as the former German colonies: Cameroon, Togoland, East German Africa (Tanganyika, Rwanda and Burundi), South West Africa (now Namibia) and New Guinea (the last two were under the control of the South African Union and Australia, respectively). The areas occupied by the United Kingdom of the German Empire (British Cameroon, British Togoland and Tanganyika) after the war were not considered part of the Empire.
