D) Freshwater is a hypotonic solution, which causes the plant cells to swell because of turgor pressure.
Explanation;
Osmosis is the process by which water molecules move from the region where they are highly concentrated to a region where they are lowly concentrated through a semipermeable membrane. One application of osmosis is support in plants.
Hypotonic solution is a type of solution that has more solvent molecules in this case water and less solute molecules.
Fresh water is hypotonic to plant cells thus the plant cells absorbs water osmotically, increases in size and becomes turgid, which generates an outside opposite pressure that is equal to the wall pressure which keeps the plants upright.
