The best example of flat character is, An old man who lived most of his life as a cynic, but then becomes an optimist after spending time with a young neighbor.
A flat character is character who's characteristic remain same through out the course of a work.
Because the old man lived most of his life as a cynic, which means he only believed that one can get motivated only by being self-interested and not having any other selfish reasons. And then he become an optimist person which means that he become a person who believe in hope and only sees that good side of things. So, through out the course of his life he believed in ability to make good things happen around him and did not developed any complex personality or emotion. So the old man did not undergoing much of the change which denotes him as a flat character.
Hence the correct option is, C. An old man who lived most of his life as a cynic, but then becomes an optimist after spending time with a young neighbor.
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