The solution that will decrease in volume is solution B.
The question states that a semipermeable membrane is placed between the two solutions, When this happens, the solutions may change in volume because this type of membrane allows for water to move through it from one solution to the other.
Water can move through the semipermeable membrane through osmosis. This means that water will travel to the solution with the highest concentration of solute in order to dissolve the solute and balance the pressure on either side of the membrane. Since solution B has a higher concentration of solute, water will travel there and increase the volume of that solution.
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