$2$ points

$($d$)$ The graph below summarizes the data collected by the student. Another student places $38\mathrm{.}1$ grams of KNO$3$ into $100\mathrm{.}0g$ of water at the temperature measured in part $($b$),$ stirs the mixture, and observes that the solid does not dissolve completely. The student plans to heat the mixture and states that the solid will completely dissolve before the mixture reaches $30C.$ Do you agree with the claim? Justify your answer with information from the graph.