Change of state implies conversion of matter from one form to another. So that the change of state required is from liquid to gas i.e option A.
Generally matter exists in different states, and they can be transformed from one state to another. Some types of states are; but not limited to: solid, liquid and gas. Each state has its unique properties which make room for easy categorization of matters with respect to their states.
From the given question, the atoms moves faster and more easily due to the application of heat. And some of those at the surface break free. So that the change of state is from liquid to gas.
An example is when a volume of water in a kettle is subjected to heat energy, its atoms moves faster and easily due to absorption of heat energy. Some of the molecules at its surface vaporize turning into gas.
Thus the correct answer is option A. liquid to gas.
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