Answer:
It is likely that the tumor is located in Vivian's occipital lobe.
Explanation:
The occipital lobe is one of the brain's 4 lobe divisions and its responsibility is sight, its main function is processing vision and interpreting what we see, such as colors, content and movement, amongst others.
Vivian's tumor is most likely located in this lobe since she's experiencing problems with her vision such as unexplained flashes of light and color. She could also experience hallucinations, blurry vision, etc.
