The correct option is D
After the defeat in the First World War, various national movements emerged that promoted the dissolution of the Empire and the formation of nation-states that welcomed the diverse ethnic groups existing in the region. In 1919, Austria-Hungary was dissolved, giving rise to the German states of Austria, the Kingdom of Hungary, Czechoslovakia, the Free State of Fiume and the State of the Slovenes, Croats and Serbs, while some regions were annexed by neighboring countries .
