A block of ice at -10°C is slowly heated and converted to steam at 100°C. Which of the following curves represents the phenomenon qualitatively ?

The temperature of ice rises till it reaches 0⁰C when it starts to melt into water at 0⁰C. Temperature remains constant till the completion of phase change. After that temperature rises again till the water reaches 100⁰C. At that point water starts boiling into steam at 100⁰C and the temperature remains constant during this phase change.