The correct answer is: C. a procedure that uses grapes left overnight in a high concentration of salt water
Osmosis is the passive process (no energy required) of solvent molecules movement through a selectively permeable membrane. The process is passive because the solvent (water) moves from the region of low solute concentration into a region of high solute concentration. This happens in order to equalize the solute concentrations on the two sides.
In the case of grapes, water will move from the grapes into the high salt surrounding water.