Using this graph and your knowledge of the relationship between sea level and global ice volume, identify the true statement. Choose one: A. Roughly 18,000 years ago, sea level was the same as it is today. B. As ice on land melts, water is transferred from the glacial reservoir to the ocean reservoir. C. Prehistoric people who wished to migrate across the Bering Strait land bridge could have done so starting about 6,000 years ago. D. Mean sea level rises as the volume of ice on land increases.