Consider dissolving each of the following solutes in the non-polar solvent hexane (C₆H₁₄) at 25 °C.
I. Propane (C₃H₈)
II. Urea ((NH₂)₂CO)
III. Glucose (C₆H₁₂O₆)
IV. Potassium nitrate (KNO₃)
Which rank order correctly lists the solutes from most soluble to least soluble in hexane?
a) I > III > II > IV
b) II > III > I > IV
c) I > II > III > IV
d) II > I > III > IV