What latitude was chosen as the dividing line between slave and free states?

A) Julia’s nicknames help her fit into her new culture.

Explanation: In the given passage from "Names/Nombres" by Julia Alvarez, we can see that she describes how her name impacted her life in America, she explains that she was called "hoo-lee-tah" just by her Dominican family, but that her friends in high school used to call her nicknames like "Jules" or "Hey Jude," with this information, we can see that the main idea that is conveyed in the passage is that Julia's nicknames helped her fit into American culture.