The answer is going to be A. the removal of all gold from the Americas. The Spanish were not even close to getting all the gold that was placed in the American continents. It is actually considered quite a failure that the Spanish went to the Americas for gold and came back with barely anything to show.
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Though the Treaty of Versailles was meant to bring about peace to the whole world, the early onset of the Great Depression in Germany due to the many provisions written in the Treaty had caused widespread resentment among the German people. Adolf Hitler used this as a foothold to gain support by saying that outsiders were finding ways to weaken Germany and his campaign was wholly successful as evidenced by what transpired later on.
In order for Hitler to gain power, he needed a scapegoat. He blame the Semitic community (Jews) in order to relieve the German people of shame they felt due to the loss of WWI. He attempted to wipe out their population because they were inferior.