Answer:
... he or she would most likely write a/an:
B. tragicomedy.
Step-by-step explanation:
Parables are short stories, usually easy to understand and that have a moral lesson at the end. Jesus, for instance, used to preach by using parables, so that even simple people would learn the lessons he wanted to convey. We can eliminate this option.
A satire does use humor, but its purpose is to expose the vices and imperfections of certain people, especially of those in power. Its purpose is to ridicule them. We can also eliminate this option.
An allegory is a story that carries a hidden meaning. A famous example of allegory is George Orwell's "Animal Farm", in which the animals and the events are representations of the Russian Revolution. This is also not the choice we are looking for.
The best option is indeed letter B. tragicomedy. This literary genre is a mix of humor and tragedy, of comedy and sadness. The instructions tell us the author wants to write a book to show "the humor and the tragedy" of something. There is no better choice than a tragicomedy.