The correct option is this: THE CELLS SHRIVELS AS WATER MOVES OUT OF THEM.
Drinking too much water makes the concentration of sodium inside the cell to be lowered compared to the concentration of sodium salt outside of the cells. Because of this, water will flow out of the cell into the surrounding medium and the cell will shrink up. Water usually flow across a semi permeable membrane in the direction where there is high concentration of solutes. Water volume remains the same in both side of a semi permeable membrane if the solution is isotonic, that is the concentration of salts on both side of the membrane is the same. In a situation where the surrounding medium is not isotonic, water flow to the region, where the concentration of salt is higher.
