The correct answer is A) Bering land bridge.
It is believed that early humans crossed the Bering land bridge to get to North America.
By the 1800s, scientist began to contemplate the idea that humans crossed the continent and entered North American territory by land. They considered that thousands of years ago there was a portion of land or a land bridge that united Asia and America: the Bering land bridge. The term Beringia or Bering was coined by the Swiss scientist Eric Hulten in 1937.