new molecules are formed. the mass of the sample is increased. the arrangement of the molecules changes. energy is absorbed by the molecules.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: As a sample of water turns to ice,
Possibilities:
- new molecules are formed.
- the mass of the sample is increased.
- the arrangement of the molecules changes.
- energy is absorbed by the molecules.

the arrangement of the molecules changes.