What do archaeologists mean when they say "ice-free corridor" in relation to the colonization of the Americas?A. An actual corridor that was largely free of ice, between the Laurentide and Cordilleran ice sheets.B. A 1,500-kilometer (932 miles) corridor that would have allowed humans to move out of eastern Beringia.C. An actual corridor that was largely free of ice, between the Laurentide and Cordilleran ice sheets, and a 1,500-kilometer (932 miles) corridor that would have allowed human

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