Answer : Option D) 0.01 percent solute concentration
Explanation : The contents of a cell if has the solute concentration as 0.04 percent then it should have much lesser concentration that the cell, then only it will allow the cell to swell. Because of the solutions with a lower osmotic pressure than a cell fluid solution concentration, can make it swell.
Hence,the answer will be 0.01 percent of solute concentration.