(A) Russia
(B) United States
(C) ** Germany
(D) Japan
EXPLANATIONS BELOW
Concept note-1: -The United States never joined so for many the League was ineffectual. Germany, after the Locarno Pact 1925 managed to secure negotiations for Germany to join. In September 1926, Germany was admitted to the League, to join all the other great powers.
Concept note-2: -Germany joined in 1926 and remained a member until Adolf Hitler withdrew the country from the League in 1933.
Concept note-3: -As part of his policy of fulfilment, Gustav Stresemann wanted to steer Germany into the League of Nations. This international organisation was set up by the Treaty of Versailles and Germany joined in September 1926.
Concept note-4: -In total, 63 states became members of the League of Nations (with at most 60 at the same time), which represents a great majority of the states existing at that time. However, the League never succeeded to become a truly universal organization.
Concept note-5: -42 countries joined at the start. By the 1930s this had risen to 60. May 1920, the US Senate voted against Versailles, thus the country did not join the League.