The correct option is C The cell in which water flows in and out of cell are in equilibrium
When a cell is placed in an hypertonic solution water is transported out of the cell and the cell shrinks or shrivels or plasmolysed. On contrary when the cell is placed in hypotonic solution the water flows into the cell causing the cells to swell and finally leading to their lysis. However, when the cells are placed in isotonic solutions there will be continuous flow of water in and out of the cell and the cell is said to be in flaccid condition. Thus, the correct option of C.