Answer: They wanted to prove that segregated buses were illegal.
Explanation: They want to bring it to court but they need the arrest of black rider so they have something to say that is illegal they shouldn't get arrested for something like that and that its illegal.
TRUE. According to Oddysseyware this is true.
What part of the book is this referring too?
It kinda all depends on the perspective on the way that you look at it. When reading pull out the main ideas about what you may think the author is trying to set forth.