If this is asking for a personal opinion, then no. I do not believe there is any relationship or connection between sanity and intelligence because someone’s mental state or background doesn’t define their intelligence or thinking patterns. Some studies done over mental disorders such as BPD (borderline personality disorder) have found sufferers to be more intelligent and, ironically speaking, happier than the average person.
Like painters and photographers of the same period, many modernist writers experimented with __.
Answer: Out of all the options presented above the one that completes the statement above and makes it true is answer choice C) Narrative Viewpoint. A great example would be a story narrated in first person. The story's perspective changes depending on what narrative viewpoint is used.
I hope it helps, Regards.