Identify the true statement. Choose one: A. Erosion due to waves in the surf causes barrier islands to move seaward, away from their lagoons. B. Global sea level seems to be rising at a slow but steady rate of 0.3 mm per year. C. Over hundreds to thousands of years, coastlines may fluctuate slightly, but often they do not change more than a few tens of meters. D. Hurricanes are huge storms that develop over warm equatorial ocean water.