The Great Lakes of North America Were Created by

The Great Lakes of North America were created by

A) ice sheets that enlarged and deepened stream valleys.
B) the melting of ice deposited in till plains of the Upper Midwest.
C) cirque glaciers associated with the Pleistocene glaciation.
D) isostatic subsidence of the crust.
E) rising sea level associated with the retreat of the Pleistocene ice sheets.