(A) Sweden
(B) ** Finland
(C) Denmark
(D) Norway
EXPLANATIONS BELOW
Concept note-1: -Along with Finland, Åland formed part of the territory ceded to Russia by Sweden under the Treaty of Fredrikshamn in September 1809. As a result, they became part of the semi-autonomous Grand Duchy of Finland (1809–1917).
Concept note-2: -The League of Nations granted Finland sovereignty over Åland in 1921. Finland was placed under an obligation to guarantee to the population of the islands their Swedish culture, language, local customs and the system of self-government.
Concept note-3: -32 A referendum was held on the Aaland Islands on December 31, 1917, and the population voted overwhelmingly for union with Sweden.
Concept note-4: -The peace settlement at the end of the war changed the geography of Europe and affected the borders of many countries. Both Sweden and Finland claimed the Aaland Islands.
Concept note-5: -Autonomy of Åland Islands In 1920, Finland granted wide-reaching cultural and political autonomy to the Åland Islands. The League of Nations considered these measures as satisfying demands to protect the Swedish language and culture there.