Abenefit of using allegories in your poetry writing can be: a.)they are easy to write b.)they are easy to understand c.)readers connect because of the shared experiences d.)there are no benefits

The answer is B. They are easy to understand. 
The utilization of Allegory has started a long time ago as it was simple for the readers and audiences to understand. It uses metaphor to enhance the meaning of the piece. It would be very hard to miss a point of this kind of writing since characters are most of the time pointedly named by the qualities the portray or represent.