Answer:
Occipital lobe is the correct answer.
Step-by-step explanation:
The occipital lobe is one of many parts that form the human brain; it is located in the back part and it is responsible for interpreting the nerve signals from the eye. In this case, John suffered from a hit in the back of his head. When this happens, the tissue in the occipital lobe sends random electrical impulses which are interpreted as flashes of light by the brain. This is why John saw stars.