Final answer:
The copper atoms in this case are undergoing the phase change of melting.Thus ,the correct answer is D) Melting.
Step-by-step explanation:
The copper atoms in this case are undergoing the phase change of melting.
When copper is in its solid phase, the atoms are held closely together in a regular pattern called a lattice. However, when the copper is heated, the energy of the atoms increases, enabling some of them to overcome the forces holding them together and move away from each other. This results in the formation of liquid copper, where the atoms are more free to move.