Refer to the plot of temperature versus time (Fig. 11.2) showing the changes in the state of ice on heating (not to scale). Which of the following is correct?
(a) The region AB represents ice and water in thermal equilibrium.
(b) At B water starts boiling.
(c) At C all the water gets converted into steam.
(d) C to D represents water and steam in equilibrium at boiling point.