It can be inferred that which of the following is most likely to be the subject of study by a geohydrologist? A. Soft, porous rock being worn away by a waterfall B. Water depositing minerals on the banks of a gorge through which the water runs C. The trapping of water in a sealed underground rock cavern through the action of an earthquake D. Water becoming unfit to drink through the release of pollutants into it from a manufacturing plant E. The changing course of a river channel as the action of the water wears away the rocks past which the river flows