The following data were collected for a new compound used in cosmetics: DH_fus = 10.0 kJ · mol^–1, DH_vap = 20.0 kJ · mol^–1; heat capacities: 30 J · mol^–1 for the solid; 60 J · mol^–1 for the liquid; 30 J · mol^–1 for the gas. Which heating curve below best matches the data for this compound?

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Temperature → (a) Heat supplied → Temperature → (c) Heat supplied → Temperature → (b) Temperature→ (d) Heat supplied → Heat supplied →