Student A has 20 percent sugar, Student B has 16.67 percent and Student C has 27.27 percent by mass. Therefore, Student C has the most concentrated solution because it contains the highest percentage of sugar.
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Evaporation is preferred to obtain a solute when the solvent is not needed. Crystallization is preferred to obtain a pure solid. Distillation is preferred when recovering the solvent or separating miscible liquids.
Option (iii) is correct. Air with dust particles and starch with water show the Tyndall effect because their dispersed particles scatter light, making the path of the light beam clearly visible to the observer nearby.