the figure shows a graph showing the solubility of substances M and N in water. Which of the following statements is not correct about the graph?
A. The solubility of substance M increases when the temperature increases.
B. the solubility of the substance N does not increase when the temperature rises more than 30 c.
c. At 40 c, the solubility of substance M is higher than the solubility of substance N.
D. At 50 c,the solution of substance N is already saturated.