Answer:
Explanation: An author might choose the genre of an allegory to convey the dream because, an allegory is a metaphor in which something generally fictional is used to explain a broad read-world problem or occurrence. Dream's often have a deeper meaning, and authors tend to look into that meaning. By doing this the author is most-likely using his dream to convey something that has happened in the real world, or he is considering that his dream is the real world. Since the dream happened while he was asleep, this count count as well. All in all, there are several reasons why an author may have chosen to use an allegory to convey the dream. It could be because they are using the dream to convey something of deeper meaning that often occurs in the real world. Or they are using something like a character to convey the dream itself.