Answer
C. Ice and water are the same molecules.
Step-by-step explanation
A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.
Thus, as ice melts, its shape changes as it acquires the ability to flow. However, the composition of the ice does not change. Melting is therefore an example of a physical change.
Hence, ice melting is a physical change because ice and water are the same molecules.
The correct answer is option C. Ice and water are the same molecules.