Why do authors use allusions in fiction and literary nonfiction texts?

a.
to make readers pause and think about the contradiction that has been created
b.
to create a contrast between how things seem and how they really are
c.
to call attention to certain words by creating rhythm with their words
d.
to readers make connections by referencing an event, a person, or another text

in 1636, roger williams settled at the tip of narragansett bay after being banished from the massachusetts bay colony for his religious views, on land granted to him by the narragansett tribe. he called the site "providence plantation" and declared it a place of religious freedom.

explanation:

answer: b

explanation: i have never watched or read about him but looked it up and it seems the most sensible answer. sorry if it's wrong. ☺

excerpt from "the   daffodils" by william wordsworth