Which theory do most scientists believe about the first inhabitants of North America?

A. They walked across the frozen Bering Land Bridge.

B. They swam across the Pacific Ocean.

C. They sailed across the Atlantic Ocean.

D. They walked across the frozen Hudson Bay Bridge.

A. They walked across the frozen Bering Land Bridge is the theory most widely accepted by scientists as the explanation for the first inhabitants of North America. It is believed that these people migrated from Asia to North America over 10,000 years ago by crossing a land bridge that connected present-day Alaska and Siberia during the last Ice Age.