The solubility of ${\mathrm{KClO}}_3$ at several temperatures is shown in the accompanying diagram.

A student mixes 10.0 g of  ${\mathrm{KClO}}_3$ with 45.0 g of ${\mathrm{H}}_2\mathrm{O}$ and stirs it for a long time at 60° C until the solution is completely clear then allows it to cool slowly 20° C where it remains clear. Which statement about the final clear mixture at 20° C is correct?

 

A supersaturated solution can be created by heating a saturated solution, adding more solute, and then gradually cooling it. A supersaturated solution contains more dissolved solute than is necessary to create a saturated solution. By adding a few crystals of the solute to a supersaturated solution, more dissolved solute crystallizes.

Hence the correct option is D