Which expression best explains why exploration create a problem for both Spain and Portugal?

Large supplies of gold and silver made the colonies wealthier than Spain or Portugal
Indigenous peoples did not convert to Christianity. Weakening their empires
Portuguese and Spanish colonists, mixed with local people which weakened the Europeans power
High prices and imbalance in trade, weakened both nations long-term

All of the expressions provided help explain why exploration created problems for both Spain and Portugal. However, the expression "High prices and imbalance in trade, weakened both nations long-term" best encompasses the various factors that contributed to the overall problem. It captures the economic consequences of exploration, such as the high costs of maintaining colonies and the imbalance in trade that resulted due to the extraction of resources by the European powers. These factors ultimately weakened both nations in the long run.

The expression that best explains why exploration created a problem for both Spain and Portugal is: High prices and imbalance in trade weakened both nations long-term.