The correct answer is C. During the ice age the sea level dropped and people crossed land
Explanation:
The Bering Land Bridge Theory claims human groups firsts arrived from Asia to America by crossing Beringia which was a natural land bridge that formed around 16000 years ago as in this zone as due to the glaciation period the level of the sea reduced and a natural bridge land between the two continents emerged. According to this theory, it was this bridge land between Siberia and Alaska human groups use to migrate to America as well as different animal species that also crossed this bridge and then spread through all the continent. Thus, in the Bering Land Bridge Theory people arrive in North America as "during the ice age the sea level dropped and people crossed land".
