Final answer:
The hypertonic solution will decrease in volume due to the movement of water particles across the semipermeable membrane following the concentration gradient. The correct option is b.
Step-by-step explanation:
The question centers on the effect of a semipermeable membrane when placed between two solutions with different solute concentrations, specifically which solution will decrease in volume.
According to the information provided, the hypertonic solution, which has a higher solute concentration, will lose water particles to the hypotonic solution due to osmosis.
This movement will decrease the volume of the hypertonic solution as water moves from the region of higher water concentration to the region of lower concentration to balance the solute concentration on both sides of the membrane.