Answer:
A, B and D aren't really that interesting. C is the best option!
I believe that the best answer to this question would be a tragedy. However, there may be more than one genre that accomplishes this goal. A tragedy is, specifically, a form of drama. It, "treats in a serious and dignified style the sorrowful or terrible events encountered or caused by a heroic individual" (this is the definition given in Encyclopedia Britannica.) A tragedy most definitely depicts the flaws in human nature.
In your story, you can write about a boy having to write an essay on a horse, and then being betrayed by a friend who took credit for the essay. Use the word antique desk as a way of incorporating imagery into your story. Use the word horse as the topic the boy used for his story or essay and use the word betrayal as how the boy felt after realizing what his friend has done. This is what I would personally do, hope it helped!
Realism is a literary movement that was created in response
to romanticism. Romanticism had at its
basis—like the name suggests—a romantic (almost too optimistic) notion of all
about which was written. Realism, on
the other hand, was just the opposite in that it portrayed society (reality) as
the way it really was almost pessimistically (or at least as it was seen by the
author) and can be seen as an equal and opposite reaction to romanticism.