Answer:
A key reason to include metaphors in a literary work is:
to create new and surprising comparisons and deepen understanding
Step-by-step explanation:
A metaphor is a literary device of the figurative language. A metaphor is a comparison between two things which a very different from each other but posses one quality common to them. Things are very different from each other. It helps in creating a better understanding to make the literary more approachable.