The best interpretation of the two flat portions of the graph where these shows that change of state are occurring. Thus, C is correct option.
A state is physical condition of any substances it means that any substance which found on earth are mainly found in three states and these are following:-
1- Solid
2- Liquid
3- Gas
A change of state is physical change of state i.e any substance which changes their state from ( solid to liquid called melting), (liquid to gas called evaporation), (gas to solid called diffusion) etc are called change of state.
These change of state occurs when temperatures or pressure changes in a system or substances. When the temperature or pressure increase the interaction between the molecules also increases.
Therefore,the best interpretation of the two flat portions of the graph where these shows that change of state are occurring. Thus, C is correct option.
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