It would be in the "B. United States" that women achieved greater economic success during the 1930s, due mostly to the fact that the US during this time was a democratic nation (unlike the others on the list).
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The answer is the light bulb.
The goal of President Franklin Roosevelt's foreign policy focused on moving the United States from isolation to intervention. He started this movement cautiously by establishing diplomatic relations and opening trade markets with the Soviet Union and Latin American through the Good Neighbor Policy.
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