The right option is; D) not change.
Cells placed in an isotonic solution would not change.
An isotonic solution is a solution that has the same total molar concentration of dissolved solutes as another solution. An example of an isotonic solution is Ringer's buffered saline. When cells are placed in an isotonic solution, the movement of water out of the cell is exactly the same as the movement of water into the cell. The effect between the isotonic solution and the cell is zero therefore, there would be no change in the cell.
