Refer to the plot of temperature versus time (figure) showing the changes in the state if ice on heating (not to scale). Which of the following is correct ?
.

Options

A. The region AB represent 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

Explanation

During the process AB temperature of the system is `0^(@)C` Hence, it represents phase change that is transformation of ice into water while temperature remains `0^(@)C`.
BC represents rise in temperature of water from `0^(@)C` to `100^(@)C` (at C).
Now, water starts converting into steam which is represents by CD.