In the electrolysis of CuSO4(aq) using copper electrodes, the reaction at the anode is

Explanation

When copper electrodes are used to electrolyze an aqueous copper sulfate solution, the following happens at the anode:

• Copper loses electrons: Copper atoms at the anode lose electrons, forming copper ions that go into the solution. 
• Anode dissolves: The anode slowly dissolves away as the electrolysis continues. 
• Copper ions are generated: Copper ions are generated at the anode.  In summary, there is dissolution of copper electrode - Option C