Correct option is C
The material that is to be electroplated is connected to the terminal of the cathode.
Here's some more information about electroplating:
Electrode function: The cathode is the electrode where reduction occurs, while the anode is the electrode where oxidation occurs.
Electrolyte: The electrolyte is a salt solution of the metal that will be used for electroplating. The electrolyte ionizes to create positively charged metal ions that move towards the anode.
Metal deposition: The metal ions from the electrolyte solution move towards the cathode and get deposited on the metal being electroplated.
Preventing oxidation: The metal being electroplated should not get oxidized or dissolved, so it is made the cathode. If the item were made the anode, it would oxidize and dissolve into the solution as ions.
