What can cause the sea level to fall? ocean basins getting smaller or water being removed from the hydrological cycle ocean basins getting larger or water being removed from the hydrological cycle ocean basins getting larger or water returning to the hydrological cycle ocean basins getting smaller or water returning to the hydrological cycle

The correct answer is

a) ocean basins getting smaller or water being removed from the hydrological cycle.

When ocean basins get smaller, there is less water in the oceans, and so the sea level falls down. Similarly, if water is removed from the hydrological cycle, there is less water going back to the oceans via precipitations (or coming from the land), therefore the sea level decreases.