How we cite our quotes:
There was something hungry in the old man's button eyes that made Coraline feel uncomfortable. "No, thank you," she said. "I'm going outside to explore." (3.90)
Coraline has a really good sense about people (especially people made out of rats). What would have happened if she'd gone with the rat-man?
Coraline backed away.
"I'm going now," said Coraline. (4.119-120)
Despite being curious, Coraline decides to not stay in the other world. Smart move, Coraline.
"Don't be silly," said Coraline. "I'm going back for them because they are my parents. And if they noticed I was gone I'm sure they would do the same for me." (5.83)
Coraline explains to the cat that she practically doesn't have a choice about going to rescue her parents. She does it "because they are [her] parents." Duh.