(A) China and Japan
(B) ** Austria and Hungary
(C) Turkey and Bulgaria
(D) USA and Germany
EXPLANATIONS BELOW
Concept note-1: -Economic problems The League sent economics experts to help Austria and Hungary. j. Kellogg-Briand Pact (1928) Sixty-five countries signed the treaty to end war – but just ignored it.
Concept note-2: -Britain and France, the two most influential members, ignored the League in their efforts to appease Hitler-actions that arguably led to the outbreak of the Second World War.
Concept note-3: -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.