Most archaeologists have held that people first reached the Americas less than 20, 000 years ago by crossing a land bridge into North America.But recent discoveries of human shelters in South America dating from 32, 000 years ago have led researchers to speculate that people arrived in South America first, after voyaging across the Pacific, and then spread northward.
Which of the following, if it were discovered, would be pertinent evidence against the speculation above?
【选项】The last Ice Age, between 11, 500 and 20,000 years ago, considerably lowered worldwide sea levels.
选项是否正确？