Which one of these served as secretary general of the League of nations?
a
Joseph Avenol
b
Trygve Lie
c
Javier Perez de Cuellar
d
Kurt Waldheim
Explanation
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Which one of these served as secretary general of the League of nations?
Joseph Avenol
Trygve Lie
Javier Perez de Cuellar
Kurt Waldheim
