Osmosis is the natural phenomenon where molecules move from a region with a lower concentration to a region with a higher concentration, relatively. IN this case, a solution that will cause a cell to swell is a solution with lower concentration. Hence, the answer would have to be 0.01 percent solute.
The solution that would cause the cell to swell is the 0.01–percent solute concentration, as it is hypotonic relative to the cell's 0.04 percent concentration. Water moves into the cell from the solution, resulting in swelling. Therefore, the correct answer is Option D.
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