(A) 1921
(B) 1927
(C) ** 1934
(D) 2021
EXPLANATIONS BELOW
Concept note-1: -September 18, 1934 general meeting of the League of Nations adopted a resolution on the admission of the USSR into the League and the inclusion of its representative to its Board as a permanent member.
Concept note-2: -Be that as it may-after 15 years of opposition the USSR had joined the Organization which, judging at least by the declarations of its founders, was created in order to safeguard general peace and to prevent a new world war.
Concept note-3: -The largest number of member states was 58, between 28 September 1934 (when Ecuador joined) and 23 February 1935 (when Paraguay withdrew). On 26 May 1937, Egypt became the last state to join the League.
Concept note-4: -Russia, now the Soviet Union, was not invited to join the League due to the radical policies of the new communist government. The Soviet Union finally became a member of the League in 1935. In November 1919, the US Senate voted against accepting membership to the League, and the nation never joined.
Concept note-5: -On December 14, 1939, the League of Nations, the international peacekeeping organization formed at the end of World War I, expels the Union of Soviet Socialist Republics in response to the Soviets’ invasion of Finland on November 30.